“Let me go!” Mrs. Deline protested, trying to shake free. “Stop it!”
Penny held fast to her hand. A big roller broke over their heads. Mrs. Deline sputtered and choked and struggled.
“Oh, this is dreadful!” she whimpered.
“You have to watch for the waves and jump just as they strike you,” Penny laughed. “Now!”
She leaped, but the widow mistimed the roller. It struck her a resounding whack on her shoulders and head.
“Oh! Oh!” she moaned.
“Here comes another!” warned Louise. “A big one too!”
Mrs. Deline broke away from Penny. She started to run for shore. The big roller overtook her, sweeping her from her feet.
This was the opportunity that Penny awaited. Pretending that she too had lost her balance, she allowed the tide to carry her straight into Mrs. Deline. For an instant they both were beneath the surface of the water.
Penny worked fast. Clutching Mrs. Deline as if in terror, she yanked hard at the slender chain that held the green elephant charm. It snapped and the jade piece came off into her hands. Deftly she thrust the charm into the front of her bathing suit. Then she popped up above the water, winking at Louise.
Mrs. Deline scrambled to her feet, clutching at the broken chain.
“See what you’ve done!” she accused Penny. “You pulled it apart. My beautiful charm has fallen into the water!”
“Let me help you look for it,” Louise offered, darting forward.
As the pair were groping about on the sandy floor, another wave rolled in. Penny neglected to warn Mrs. Deline. It struck her from behind, toppling her over on her face. Her cap slipped awry and she swallowed salt water.
“Oh, I can’t stand any more of this!” she spluttered. “It was cruel of you to get me to come into the surf! Now I’ve lost my charm, and it was all your fault, Penny Parker.”
“I’ll buy you another ornament,” the girl offered. Seeing Mrs. Deline’s distress she felt a bit ashamed of herself.
“Another ornament!” the widow mocked. “I don’t want another! I want the one I’ve lost. It’s of vital importance to me to keep it.”
Mrs. Deline made another futile search for the charm.
“It’s been washed away,” she cried. “I’ll never find it now!”
Glaring furiously at Penny, she turned and fled to the bath house.
“Did she really lose the charm?” Louise demanded the moment the girls were alone. “Or did you get it, Penny?”
Penny answered by producing the green elephant charm from the front of her bathing suit where she had hidden it.
“Easy as taking candy from a babe,” she chuckled. “My, but was she hopping mad!”
“You may not be laughing if your father hears about this,” Louise warned. “He’s apt to look at matters from a different angle than we do.”
Penny skipped through the shallow water and sat down on the beach well beyond the reach of the waves. Louise flopped beside her. Eagerly they examined the jade green trinket.
“Looks like any ordinary charm to me,” Louise remarked. “No special carving.”
“It should open,” Penny said. “The first night when Mrs. Deline and I shared a room, I was sure I saw her close it.”
Louise turned the charm over and pried at it with a hairpin.
“It does have a back lid!” she exclaimed excitedly. “Penny, I think it’s going to open!”
“I’ll say magic words while you work,” Penny laughed. “Furthermore, I’ll keep watch of the bath house. We don’t want Mrs. Deline to pop out here and see us.”
Louise pried again at the lid of the charm. It gave suddenly.
Inside the tiny cavity was a folded piece of paper. While Louise stared in delighted awe, Penny gained possession. With nervous haste she unfolded the paper. She gazed at it a moment and her face fell.
“Why, I can’t make anything of the writing!” she declared in disappointment. “The words don’t make sense.”
“Just a mess of letters,” Louise agreed, peering over her shoulder.
The girls were decidedly let-down for they had gone to much trouble and risk to obtain the jade ornament. But Penny’s disappointment did not last long. As she stared at the paper, its significance dawned upon her.
“Why, this is important, Lou!” she cried. “Maybe we’ve stumbled into something big!”
“How do you mean?”
“Don’t you see?” Penny demanded triumphantly. “The letters, of this message must comprise a secret code! If only we can break it down we may learn all we need to know about Mrs. Deline and her strange friends!”
While Penny and Louise were puzzling over the strange writing found inside the jade charm, Mrs. Deline appeared in the doorway of the bath house. Barely in time to escape detection, the girls hid the tiny elephant and the paper in the sand.
Mrs. Deline crossed the beach to speak to the girls. Her hair was damp and stringy, her face pinched and blue from cold.
“Here’s your suit!” she snapped, slapping the wet garment into the sand at Penny’s feet. “I hope you enjoyed the swim! I’m sure I didn’t.”
Turning her back, the widow marched to the hotel.
The moment Mrs. Deline had disappeared into the white brick building, Penny dug the jade elephant and paper from the sand.
“Let’s get dressed,” she urged Louise. “We’ve no time to waste.”
So thrilled were the girls over what they had accomplished that they could talk of nothing else. Penny felt that by obtaining the jade elephant she had proven her case.
“You thought I was only jealous of Mrs. Deline,” she told Louise triumphantly as they dressed in adjoining booths. “Now what do you say?”
“That you’re a genius!” Louise praised. “Mrs. Deline certainly is mixed up in some shady business.”
Once dressed, the girls wrapped the jade elephant in a handkerchief and carried it to the hotel. Jerry was nowhere to be found, and a bellboy told Penny that her father had gone for a walk.
“Perhaps we can work the message out ourselves,” Penny suggested hopefully. “Let’s try.”
In their hotel room, the girls spent an hour attempting to decipher the strange jargon of letters appearing on the paper. At the end of that time. Penny tossed aside her pencil in disgust.
“This is a job for an expert,” she declared. “I certainly don’t classify as one.”
The telephone jingled. Penny answered it and was delighted to hear Jerry’s familiar voice. He was down in the lobby and had been told that the girls wished to see him.
“We certainly do!” Penny answered gaily. “Hold everything! We’ll be with you in a jiffy.”
The elevator being entirely too slow, the girls raced down the stairs. Breathlessly they started to tell Jerry what they had learned.
“Not here!” he said quickly. “Let’s go outside where we won’t be overheard.”
Once out in the open with no one close by, Jerry lent an attentive ear to Penny’s tale of their afternoon adventure. He did not have much to say in return, but he studied the jade green elephant and the paper with deep interest.
“You don’t think it’s anything?” Penny asked in disappointment.
“On the contrary, it may be something of very great importance,” he returned soberly. “I’ll take this to Headquarters. We have an expert on codes who should be able to break it in a short while.”
The girls hoped that Jerry would invite them to accompany him, but he did not do so. Instead he said:
“Penny, you were telling me that Mrs. Deline had buried a package in the sand. Any luck in finding it?”
“Not a bit.”
“You don’t think that she went back there and dug it up herself?”
“We didn’t see any footprints.”
“How did you mark the place?”
“By a stick that someone removed.”
“Not a very reliable way to take observations,” Jerry remarked. “Ever try the clock system?”
The girls looked blank.
“For example,” Jerry illustrated, “imagine that the landscape is like the face of a clock. Now what do you see on the hour of two?”
“I don’t get it,” Louise complained.
“Oh, I do!” laughed Penny. “A big tree!”
“That’s right,” agreed Jerry. “And at the hour of six?”
“Why, a signboard!” chuckled Penny. “At the hour of seven there’s a big sand dune!”
“If you picture things in your mind as if they’re on the face of a clock it’s much easier to remember and keep them in proper proportion. Now, using that same system can you recall anything more about the place where Mrs. Deline buried the package?”
“Not very much,” Penny admitted. “I didn’t take notations at the time.”
“Speaking of signboards, I remember one,” Louise said thoughtfully. “It was a long distance back from the beach, slightly to the right. A cigarette advertisement.”
“That’s right!” agreed Penny.
“Perhaps that will help some,” Jerry said. “We’ll have to find the package.”
“Then you believe Mrs. Deline is an Enemy Agent?” Penny asked eagerly.
“I’ve thought so for quite a while now,” Jerry admitted. “I didn’t say it for fear of building up your hopes. Anyhow, we’ve got to work quietly in this business.”
“Poor Dad,” Penny murmured, “I’m afraid it will break him up to learn the truth. Do you say I should tell him right away, Jerry?”
“Why not?” Jerry demanded, his eyes amused. “Your father may have a few things to break to you too, Penny.”
“Meaning what?”
“I’ll let your father do his own talking,” Jerry said, getting up from the hotel bench. “Have to go now.”
“Wait!” Penny pleaded. “You’ve not told us anything. Do you think Mrs. Deline has been aiding that flier who escaped from a Canadian prison camp?”
Jerry deliberately let the question pass. “Listen!” he said urgently. “I may not see you girls again until after dinner. Want to help me tonight?”
“Doing what?” Penny asked.
“I want you to lead me to the place where Mrs. Deline buried that package.”
“We’ll do our best.”
“Then if I don’t see you earlier, meet me here at nine o’clock. It should be dark by that time.”
“We’ll be here,” Penny promised, her eyes glowing.
At dinner that night the girls told Mr. Parker of their appointment to meet Jerry. Penny would have explained about the package, but before she could do so, Mrs. Deline joined the group. Mr. Parker immediately invited her to dine with them. To the annoyance of Penny and Louise she accepted with alacrity.
The girls fully expected that Mrs. Deline would make some reference to the incident of the afternoon. Instead she avoided the subject, talking of her experiences in China and the Orient. Despite their prejudice, Penny and Louise were compelled in all honesty to acknowledge to themselves that the widow was a brilliant, entertaining conversationalist.
Over the coffee cups Mrs. Deline spoke casually of a play which was showing at the local theatre. Before Penny could say a word, Mr. Parker had suggested that he buy tickets for the night’s performance.
“I’d love to go,” Mrs. Deline accepted instantly.
“Good!” Mr. Parker, approved. “I’ll get four tickets.”
“Two,” Penny corrected grimly. “Louise and I already have an appointment.”
“That’s so,” Mr. Parker recalled belatedly.
Mrs. Deline looked so pleased that Penny was sorely tempted to abandon the meeting with Jerry. Only the realization that the task ahead was vitally important, kept her silent.
At eight o’clock Mr. Parker and Mrs. Deline left the hotel for the theatre. With an hour to kill, Penny and Louise were very restless. They read the evening paper and watched the clock.
“Here’s an interesting news item,” Penny remarked, indicating a brief story on an inner page of the paper. “It says an enemy submarine was sighted not many miles from here—just off the coast.”
“Did they get it?” Louise inquired absently.
“I guess not. The story doesn’t say, except that the air patrol dropped bombs.”
“Wonder what a single sub was doing so close here?” Louise speculated. “Oh, well, we’ve nothing to fear.”
A clock chimed the hour of nine. On the first stroke, the girls arose and hastened to keep their appointment with Jerry. The night was closing in dark. Along the shore no lights were showing for the dim-out was rigidly enforced at Sunset Beach.
“Where’s Jerry?” Penny asked as they reached the bench where they had promised to meet him. “Hope he didn’t forget.”
Ten minutes elapsed. Penny was examining the luminous dial of her wrist watch when someone came striding down the gravel path.
“Hello,” Jerry greeted the girls. “Sorry to have kept you waiting. All set for adventure?”
“Lead on!” Penny laughed.
Taking each of them by an elbow, Jerry guided the girls down the deserted beach. Twice they passed guards who merely stared and allowed them to pass unchallenged.
“Any news about that code?” Penny questioned as they walked along.
“It’s a tough one to break,” Jerry replied briefly. “Experts have been trying to take it apart ever since I left you girls this afternoon.”
“Then it really is something?” Penny asked, scarcely daring to hope.
“It certainly is,” Jerry replied heartily. “We’re pretty sure now that Mrs. Deline is mixed up in a bad business. But we can’t act until we know absolutely.”
“This will be a horrible shock to Dad,” Penny remarked. “He’s at the theatre with Mrs. Deline now.”
“At least she’s out of the way, so there’s no chance she’ll see us at work,” Jerry commented. “Think you can find the place to dig?”
Penny had marked it well in her mind, but at night everything looked different. After some uncertainty, the girls agreed upon the dune where the package had been buried.
“With the tide low we’ll have plenty of time,” Jerry said. “Well, let’s go! Was the package buried deep?”
“Not more than a foot,” Penny supplied.
“Then if it’s here, we’ll find it. Let’s block this area off and cover it systematically.”
For an hour the trio toiled. Twice one of the beach guards passed by and Penny was surprised that he paid no heed to what they were doing.
“Orders!” Jerry chuckled. “You didn’t think we could come out here and prowl around without questions being asked? The guard was tipped off. He’ll help us by whistling if anyone comes this way.”
Louise, who had been industriously digging, gave a low cry.
“Find something?” Jerry demanded.
“I’m not sure. I think so.”
The next instant Louise lifted a small package from its sand tomb. Before Jerry could warn her, she had torn apart the pasteboard cover.
“Why, it contains pencils!” she exclaimed in disgust. “Pencils!”
Jerry leaped to her side. One glance and he took the box from her.
“Those objects may look like pencils,” he drawled. “But take it from me, they’re a bit more deadly.”
Penny had moved close. She and Louise stared in awe at the collection.
“Bombs,” Jerry explained briefly. “One of these little pencils contains enough explosive to blow us all to Kingdom Come!”
The cardboard box contained in addition to the pencil bombs a shiny knife and several grooved, pear-shaped objects.
“What are those?” Louise asked curiously. “They look like hand grenades.”
“That’s what they are,” said Jerry, lifting one from the box. “It’s a mighty useful weapon for close fighting. A strong man can throw a grenade twenty-five to thirty-five yards and it does damage over a large area.”
Penny gingerly inspected one of the grenades.
“It won’t bite you,” Jerry laughed. “Nor will it explode in your hand. When you’re ready to throw a grenade you hold it with the lever under your fingers. Just before you toss it, pull the pin.”
“Isn’t it apt to explode while you’re holding it?” Penny asked dubiously.
“Not while the lever is held. When the grenade leaves the hand, the lever flies off. Then the fuse ignites and in about seven seconds you have your explosion.”
“Nice little gadgets,” Penny said. She replaced the grenade in its box and ran a finger over the sharp edge of the steel-bladed knife.
“Mrs. Deline evidently planted these weapons here for someone else to use,” Jerry remarked. “We’ll put them back just as they were.”
“Put them back!” Penny echoed. “Why, Jerry, wouldn’t that be playing right into their hands? Shouldn’t we destroy these things?”
“No, it’s much wiser to have the place watched.”
Light dawned upon Penny. “Oh, I see!” she exclaimed. “In that way you hope to learn Mrs. Deline’s accomplices!”
“Exactly.”
Jerry replaced everything in the box which he carefully buried in the sand. Then he obliterated all freshly made footmarks.
“It may be necessary to watch this place for days,” he said thoughtfully.
“And what of Mrs. Deline?” Penny asked. “Will she be allowed complete freedom?”
“That’s for my superiors to decide. It seems to me, though, that more is to be gained by allowing her to remain at liberty than by arresting her.”
“I’m all for jail myself,” said Penny.
“Just be patient,” Jerry smiled. “And whatever you do, don’t drop a hint to Mrs. Deline of what we suspect.”
“She knows I dislike her.”
“That’s all right, but don’t let her guess that you consider her guilty of anything more serious than making a play for your father.”
“What about Dad? Shouldn’t I warn him?”
“Let me take care of that part,” Jerry smiled.
“All right,” Penny agreed reluctantly. “Just be sure that you don’t muff it. Remember, you’re playing with my future!”
Jerry finished smoothing out the footprints in the sand and then escorted the girls to the hotel.
“I must report to Headquarters without delay,” he said, pausing at the hotel entrance. “Don’t worry about the package. We’ll have the place watched every minute.”
After Jerry had gone, Penny and Louise entered the hotel.
“Is my father here yet?” Penny asked the desk clerk.
“No, Miss. And there’s a message for him. As soon as he comes in he’s to call Major Gregg.”
Penny repeated the name thoughtfully. “That’s a new one on me,” she remarked. “Dad seems to have friends I know nothing about.”
“Oh, the Major comes to the hotel frequently,” the clerk returned, smiling. “He and your father are well acquainted.”
As the girls crossed the lobby to a drinking fountain, Louise said teasingly:
“I’m afraid you’ve lost track of your father lately, Penny. You’ve been so upset about Mrs. Deline that you’ve scarcely noticed anything or anyone else.”
“Dad’s been holding out on me, that’s evident. Wonder what he’s to call Major Gregg about?”
“Why not wait up and see?”
“Not a bad idea,” Penny approved instantly. “He and Mrs. Deline should be getting in anytime now.”
“I’m not waiting up,” announced Louise with a sleepy yawn. “In fact, I’m on my way to bed this minute.”
To prove her words she started for the elevator. Penny debated whether or not to follow and finally decided to remain in the lobby.
An hour elapsed. Penny was half asleep by the time Mrs. Deline and Mr. Parker entered the hotel together. They were chatting animatedly and would not have seen her had she not scrambled from the wing chair.
Seeing Penny, Mrs. Deline quickly bade Mr. Parker good night and vanished into an elevator.
“You shouldn’t have waited up,” Mr. Parker chided his daughter. “Why, it’s nearly midnight.”
“There’s an important message for you, Dad. You’re to call Major Gregg.”
Mr. Parker looked disconcerted. “How long ago did that call come, Penny?”
“About an hour ago. Or that’s when I learned of it.”
Mr. Parker went quickly to a telephone booth and was gone for some time. When he returned his face was animated.
“Good news?” Penny asked eagerly.
“Not exactly,” Mr. Parker replied, sliding into a chair beside her and dropping his voice. “A message from Interceptor Headquarters. Monitoring machines have traced the outlaw radio station again. The broadcast finished about an hour ago.”
“And where was the station located this time, Dad?”
“Seemingly at or near the lighthouse.”
“The lighthouse!” Penny exclaimed. She was so startled that her voice rose to a high pitch, attracting the attention of a passing bellboy.
“Not so loud, Penny,” her father warned. “The strange thing was that the broadcast seemed to come from a cave, the same as before, although the monitoring machines charted it as being close to the lighthouse.”
“The only one I know about near the Point is Crystal Cave,” Penny said thoughtfully. “Dad, maybe the broadcast did come from the lighthouse!”
“That’s government property. Penny, and the man in charge is beyond suspicion. Furthermore, the deep, echo effect couldn’t come from anywhere except a cave.”
“Unless it were a sound effect, Dad.”
“What’s that?” Mr. Parker asked, startled. “I don’t get you, Penny.”
“I mean, maybe the cave set-up is just a sound effect and nothing more. Only the other night I heard one in a radio play and it sounded as if the actors really were in a cave. Isn’t it done by an echo chamber or something of the sort?”
“That would be possible,” Mr. Parker agreed. “At Interceptor Headquarters it was assumed that a mistake had been made in charting the location of the station.”
“Then the lighthouse hasn’t been investigated?”
“Not to my knowledge.”
“Well, it should be!” Penny exclaimed. “Louise and I were there today and we saw—”
“Yes?” Mr. Parker questioned as she suddenly broke off.
“We saw a lot that didn’t look right,” Penny finished, deciding not to bring Mrs. Deline’s name into the discussion. “Mr. McCoy had visitors and while they were there he kept us locked up.”
“My word! Why didn’t you report to the police?”
“Well, we weren’t entirely sure,” Penny said lamely. “The door just closed and locked, and Mr. McCoy let on that it had a trick latch. Then he released us, but not until after the visitors had gone.”
“Did you see the persons?”
“No, we only heard their voices. We weren’t able to overhear any of the conversation.”
Without explaining what he intended to do, Mr. Parker again closed himself into a telephone booth. Not until he returned did he tell Penny that he had called Interceptor Headquarters and that Army men had been sent to the lighthouse to make a thorough check-up.
“Now it’s late,” he said briskly, “and you’re overdue for bed, Penny. Better fly up.”
“Aren’t you coming?”
“Not just now. I have a little unfinished business.”
Penny hesitated, unwilling to go to bed when she sensed adventure in the offing. As she groped in her mind for an excuse to remain, the doors at the front entrance to the hotel began to spin. Jerry came hurrying into the lobby. Seeing Penny and her father he made a straight line for them.
“The code’s been broken!” he announced, addressing Penny.
“What did they learn, Jerry?” she asked eagerly.
“It’s just as you thought, Penny.” Jerry dropped his bombshell. “Mrs. Deline definitely is an Enemy Agent. Apparently she was sent to Sunset Beach to aid that escaped prisoner I told you about!”
As Jerry made the startling announcement, Penny glanced anxiously at her father. In the excitement of the moment she had not thought how much of a shock it might be to him to learn that Mrs. Deline was an agent employed by a foreign country. To her astonishment, he looked neither surprised nor dismayed.
“So you have the proof, Jerry!” Mr. Parker exclaimed. “That’s fine! But what’s all this about a code? How did you stumble onto it?”
“No time for details now,” Jerry answered tersely. “Penny turned the trick—she and Louise saw Mrs. Deline bury a package in the sand.”
“And Mrs. Deline brought that package from the lighthouse,” Penny interposed eagerly. “Mr. McCoy must have given it to her.”
“What’s the plan of action?” Mr. Parker demanded. “Army men already have gone to the lighthouse to search that place thoroughly.”
“Our job is to keep watch of the dune where the package was buried. Naturally we have no way of knowing what time anyone will show up there. It may be an all night wait.”
“I’ll be with you in a minute,” Mr. Parker declared. “Just as soon as I get an overcoat.”
He started toward the elevator, then came back to the group.
“What about Mrs. Deline?” he asked. “She’s here in the hotel. Went to her room only a few minutes ago.”
“She’ll be placed under arrest,” Jerry said. “Better call her on the telephone and get her down here. Don’t let her suspect that you think anything is wrong.”
Mr. Parker vanished into the nearest telephone booth.
“I can’t understand it,” Penny murmured to Jerry. “I was sure Dad was head over heels in love with Mrs. Deline. Why, it didn’t even seem to ruffle him when he learned the truth about her.”
Jerry grinned. “Maybe,” he drawled, “that was because he knew all the time.”
Penny was dumbfounded. “You mean—” she stammered, “You mean that Dad’s been acting a part? Pretending to admire Mrs. Deline while actually he didn’t?”
“Something like that. You see, your Dad became interested in the outlaw radio station and the men who operate it. By making inquiries before he left Riverview, he obtained information that made him think Mrs. Deline might be involved in some way. He knew she never had been in China but spent many years in Japan. He learned also that instead of being a newspaper correspondent, she had carried on secret work for various governments.”
“Dad knew all that! And he never let on to me!”
“He couldn’t very well, Penny. If you had guessed the truth, you’d have given it away by your manner—no matter how much you tried to act natural.”
“What a little nit-wit I’ve been!”
“You have not,” Jerry denied warmly. “Anyone else would have acted the same. Without knowing it, you helped your father a lot. You turned up evidence he never could have obtained alone.”
“Where do you fit into the picture, Jerry? Did Dad send for you?”
“You don’t send for anyone in the Army,” Jerry explained, grinning. “By pure luck I was assigned here on a special mission. Your father learned I was coming, so we united forces.”
“Then you’ve both known from the first about Mrs. Deline?”
“We’ve had a dark brown suspicion, Penny. But no proof until tonight.”
Penny drew a deep breath. Before she could ask another question, her father came hurrying down the hotel corridor.
“Mrs. Deline’s not in her room!” he reported. “She doesn’t answer.”
“She went upstairs only a few minutes ago,” Penny recalled.
“Yes, she did, but she’s not there now.”
“Maybe she’s asleep,” Jerry said, “and failed to hear the ’phone. We’ll have to check.”
Without explaining why the matter was urgent, Mr. Parker arranged with the desk clerk to have one of the hotel maids go to Mrs. Deline’s room. While the trio waited in the upstairs corridor, the woman rapped several times on the bedroom door, and failing to get a response, unlocked it with her master key.
“Mrs. Deline!” she called, softly at first, then in a louder voice.
There was no answer.
The maid then snapped on the light. “Why, there’s no one here!” she cried. “The bed’s not been slept in!”
“That’s what I was afraid of,” muttered Mr. Parker.
With Jerry and Penny, he entered the bedroom. Everything was in perfect order. However, Mrs. Deline’s suitcase was gone and all her belongings had been removed from the closet.
“She’s skipped without paying her room rent!” the maid exclaimed. “I’ll call the manager!”
Penny was peering into the waste paper basket beside the desk.
“Look!” she drew the attention of her father and Jerry. “Burned letters and papers!”
Digging into the basket, she brought up several charred sheets of paper. They were unreadable and crumpled in her hand.
“This was a bad break for us—Mrs. Deline getting away!” Jerry exclaimed in disgust. “Evidently her work at Sunset Beach is finished. She’s moving on to another pasture.”
“But she can’t be far away,” Penny reasoned. “After all, we know when she came to her room.”
“There still may be a chance to nab her,” Mr. Parker said. “We’ll notify the police to guard all the roads and the airport. I’ll report to Major Gregg too.”
Without awaiting the arrival of the hotel manager, the trio hastened to the lobby. There Jerry and Mr. Parker made several telephone calls.
“Now let’s be on our way up the beach,” Jerry urged anxiously. “We’ve killed too much time as it is.”
Penny half expected that her father would refuse permission for her to go along. To her delight he merely said:
“I suppose there’s no keeping you here, Penny. Well, come with us. I guess you’ve earned the right by your good work.”
It was a dark night, warm but misty. No lights were showing outside the hotel, though far up the beach the powerful lighthouse beacon cut swathes across the black sea.
“What’s the plan?” Mr. Parker asked Jerry.
“The entire coast for fifty miles is being watched. I thought just on a chance we might keep vigil at the place where Mrs. Deline buried the package of explosives. Someone may show up there. On the other hand, Penny tipped off the fact that she knew where the bundle was buried.”
“Mrs. Deline watched Louise and me through a spy glass,” Penny recalled ruefully. “She knew we didn’t find the package though.”
“That’s our assignment anyhow,” Jerry said. “To keep watch of that particular place until relieved by Army men.”
The Parker car was on the hotel lot close by. Getting it, the trio took the beach road but stopped some distance from the lighthouse. Not wishing the car to attract the attention of any passer-by, it was left parked on a private driveway. Jerry, Penny and her father then crossed the dunes afoot and proceeded up the beach until they came to their station.
“Think this is the place?” Penny asked skeptically.
“I know it is,” Jerry replied. “Remember what I told you about taking observations? Let’s see if the package is still here?”
He began digging in one of the dunes. Almost at once he came upon the box of explosives.
“Exactly as we left it,” he reported, replacing the sand. “No one’s been here.”
“I doubt anyone will come,” Mr. Parker commented. “Probably afraid.”
High overhead and out of sight, Penny heard the drone of planes on coastal patrol. She stared up into the dark sky and then toward the sea. The tide was coming in and long rolling waves washed the beach, dashed themselves on the shoreline and retreated.
“We’ll have to get down out of sight,” Jerry warned. “Mustn’t be seen from the road or the ocean either one.”
“How about this spot?” Mr. Parker suggested, pointing to a hollow between two giant dunes.
The place seemed exactly right, so the trio flattened themselves on the sand. Jerry looked at the luminous dial of his watch.
“One fifteen,” he announced. “No sign of activity.”
“And no sign of any soldiers,” Mr. Parker added. “I hope that whoever is to take over here shows up before long.”
“I don’t,” Penny said, snuggling close between her father and Jerry. “I’m having fun!”
“If anything should develop, it’s apt to be serious business,” Jerry warned. “I’m inclined to think that we tipped our hand and nothing will happen.”
An hour elapsed. During that time there was no sound save the roar of the restless sea. The warm sand made a comfortable couch, and despite her best intentions, Penny caught herself dozing. She had all she could do to keep awake.
“What time is it now?” she presently asked.
“Two thirty-five,” Jerry answered. “It doesn’t look as if there’s to be any activity, but then the night’s young.”
“The night may be, but I’m not,” Mr. Parker grumbled, shifting into a more comfortable position. “Wonder when our relief is to show up?”
“Must be some mix up on orders. We’re probably stuck here for the night.”
“In that case, Penny should return to the hotel.”
“Oh, no. Dad! Anyway, if I left now I might attract the attention of anyone watching this place.”
“You thought that one up!” her father chuckled. “Except for ourselves, there’s no person within a quarter of a mile of this place.”
“You’re wrong about that,” murmured Jerry, stiffening to alert attention.
“What’s up, Jerry?” Mr. Parker said quickly. “You act as if you were seeing things!”
“I am, Chief! Look to the right—between us and the lighthouse!”
Mr. Parker and Penny gazed intently in the direction indicated.
“Can’t see a thing,” Mr. Parker whispered. “Your eyes must be tricking you, Jerry.”
“Wait just a minute.”
Even as Jerry spoke, a shadowy figure emerged from the mists. The man came swiftly down the beach, making no sound as he walked. When he was very close, the revolving beacon of the lighthouse singled him out for a fleeting instant. Brief as was the moment of illumination, Penny recognized the man.
“George Emory!” she whispered tensely. “What’s he doing here?”
The answer to Penny’s whispered question soon became obvious. George Emory looked carefully about the windswept beach. The three tense watchers thought that he might approach the dune where they lay hidden, but he did not.
Instead, the man paused while several yards away and gazed toward the sea. A moment he stood thus, silhouetted against the sky. Then using a glowing flashlight, he began making wide sweeps with his arm.
“A signal!” Jerry whispered. “He’s trying to attract the attention of a boat out at sea!”
“Shall we go for him?” asked Mr. Parker.
“Wait!” Jerry advised. “He’s not the only one we’re after. We’re stalking bigger game.”
At intervals for the next fifteen minutes, George Emory repeated the flashlight signals. Then he turned off the light and waited.
Anxiously, Jerry, Penny and Mr. Parker kept their faces turned to the sea. They sensed that the hour of action was at hand, and it worried them that Army men had failed to arrive.
“Look, Dad!” Penny suddenly whispered. She had glimpsed far from shore a long shadowy object which easily could be a boat. No lights were showing nor had she heard any sound.
“I don’t see a thing,” Mr. Parker whispered back. “Yes! Now I do! Jove! It looks like a submarine that’s surfaced. I can make out the conning tower!”
“But why would it dare come here?” Penny speculated. “Won’t it be detected by the patrol planes?”
“Tonight’s a bad night,” Jerry pointed out. “Besides, the shore is so indented at this point of coast that perfect protection is almost impossible. They’re sending a boat, that’s sure!”
A small craft had been launched from the wave-washed deck of the submarine. Manned by two men who rowed with muffled oars, it slowly approached the shore. When it was very close the watchers behind the sand dune saw by its grotesque sausage shape that it was a large, rubber boat. Like a gray ghost it slid over the water.
Mr. Parker gripped Penny’s hand in an encouraging squeeze.