ContentsPrefaceIThe CrimeIISpeculationsIIIAt the ValeIVThe Missing LetterVA Mysterious VisitVIAt Leveson SquareVIIValuable InformationVIIIEnter Mr. AlleryIXA ConfessionXThe PortraitXIAn ApparitionXIIWhat Happened in the NightXIIIThe Car in the DarkXIVBack in LondonXVThe CrisisXVIThe Criminal FoundXVIIThe Wrong Letter