CONTENTSCHAPTER I—THE TOLL IS EXACTEDCHAPTER II—"FRIENDS OF THE POOR"CHAPTER III—ENGINEERING-CRIMINOLOGYCHAPTER IV—THE CAR IN THE FOGCHAPTER V—THE HAUNTED TREECHAPTER VI—THE FLAMING HANDCHAPTER VII—SPIRIT CLUESCHAPTER VIII—THE GIRL ON THE HORSECHAPTER IX—LUCYCHAPTER X—CROSSED THEORIESCHAPTER XI—TELEPHONE CALLSCHAPTER XII—SATURDAYCHAPTER XIII—A PUZZLING WARNINGCHAPTER XIV—THE INTRUDERSCHAPTER XV—THE MASK OF DEATHCHAPTER XVI—THE FATAL DANCECHAPTER XVII—AT THE DOORSTEPCHAPTER XVIII—TRIANGULATIONCHAPTER XIX—FACE TO FACECHAPTER XX—THE INVISIBLE DETECTIVETHE SECRET TOLL

CHAPTER I—THE TOLL IS EXACTEDCHAPTER II—"FRIENDS OF THE POOR"CHAPTER III—ENGINEERING-CRIMINOLOGYCHAPTER IV—THE CAR IN THE FOGCHAPTER V—THE HAUNTED TREECHAPTER VI—THE FLAMING HANDCHAPTER VII—SPIRIT CLUESCHAPTER VIII—THE GIRL ON THE HORSECHAPTER IX—LUCYCHAPTER X—CROSSED THEORIESCHAPTER XI—TELEPHONE CALLSCHAPTER XII—SATURDAYCHAPTER XIII—A PUZZLING WARNINGCHAPTER XIV—THE INTRUDERSCHAPTER XV—THE MASK OF DEATHCHAPTER XVI—THE FATAL DANCECHAPTER XVII—AT THE DOORSTEPCHAPTER XVIII—TRIANGULATIONCHAPTER XIX—FACE TO FACECHAPTER XX—THE INVISIBLE DETECTIVE

CHAPTER I—THE TOLL IS EXACTED

CHAPTER II—"FRIENDS OF THE POOR"

CHAPTER III—ENGINEERING-CRIMINOLOGY

CHAPTER IV—THE CAR IN THE FOG

CHAPTER V—THE HAUNTED TREE

CHAPTER VI—THE FLAMING HAND

CHAPTER VII—SPIRIT CLUES

CHAPTER VIII—THE GIRL ON THE HORSE

CHAPTER IX—LUCY

CHAPTER X—CROSSED THEORIES

CHAPTER XI—TELEPHONE CALLS

CHAPTER XII—SATURDAY

CHAPTER XIII—A PUZZLING WARNING

CHAPTER XIV—THE INTRUDERS

CHAPTER XV—THE MASK OF DEATH

CHAPTER XVI—THE FATAL DANCE

CHAPTER XVII—AT THE DOORSTEP

CHAPTER XVIII—TRIANGULATION

CHAPTER XIX—FACE TO FACE

CHAPTER XX—THE INVISIBLE DETECTIVE

THE SECRET TOLL

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