Contents
| Chapter | Page | |
| Characters of the Book | ix | |
| I. | A Double Tragedy | 1 |
| II. | The Investigation Opens | 12 |
| III. | At the Greene Mansion | 28 |
| IV. | The Missing Revolver | 44 |
| V. | Homicidal Possibilities | 60 |
| VI. | An Accusation | 73 |
| VII. | Vance Argues the Case | 87 |
| VIII. | The Second Tragedy | 101 |
| IX. | The Three Bullets | 116 |
| X. | The Closing of a Door | 129 |
| XI. | A Painful Interview | 143 |
| XII. | A Motor Ride | 158 |
| XIII. | The Third Tragedy | 174 |
| XIV. | Footprints on the Carpet | 189 |
| XV. | The Murderer in the House | 204 |
| XVI. | The Lost Poisons | 218 |
| XVII. | Two Wills | 231 |
| XVIII. | In the Locked Library | 243 |
| XIX. | Sherry and Paralysis | 257 |
| XX. | The Fourth Tragedy | 269 |
| XXI. | A Depleted Household | 283 |
