ContentsI“Who Killed Cock Robin?”IIOn the Archery RangeIIIA Prophecy RecalledIVA Mysterious NoteVA Woman’s ScreamVI“ ‘I,’ Said the Sparrow”VIIVance Reaches a ConclusionVIIIAct TwoIXThe Tensor FormulaXA Refusal of AidXIThe Stolen RevolverXIIA Midnight CallXIIIIn the Bishop’s ShadowXIVA Game of ChessXVAn Interview with PardeeXVIAct ThreeXVIIAn All-Night LightXVIIIThe Wall in the ParkXIXThe Red Note-bookXXThe NemesisXXIMathematics and MurderXXIIThe House of CardsXXIIIA Startling DiscoveryXXIVThe Last ActXXVThe Curtain FallsXXVIHeath Asks a Question