| I. | A Mysterious Affair | | II. | How the Chase Ended | | III. | The Shadow That Lay Behind | | IV. | Clews and Suspicions | | V. | The Riddle of the Night | | VI. | A Little Discrepancy | | VII. | "Coming Events Cast Their Shadows Before" | | VIII. | Ailsa Lorne | | IX. | Blind Groping | | X. | Another Strand in the Web | | XI. | The Cloudburst | | XII. | The Thunderbolt | | XIII. | A Question of Veracity | | XIV. | A Change in the Program | | XV. | A Clew from the Air | | XVI. | A Bold Stroke | | XVII. | A Blunder and a Discovery | | XVIII. | Springing a Surprise | | XIX. | Picking up Threads | | XX. | "How Sharper Than a Serpent's Tooth" | | XXI. | When Two and Two Make Four | | XXII. | When Four and Four Make Eight | | XXIII. | The Lady at the Gate | | XXIV. | The Mousetrap | | XXV. | The Fly in the Ointment | | XXVI. | The Open Window | | XXVII. | The View Halloo | | XXVIII. | Loisette is Vindicated | | XXIX. | "Quick! Fire!" | | XXX. | Nearing the Truth! | | XXXI. | How the Truth Was Told |
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