Contents
| Chapter | Page | |
| Characters of the Book | ix | |
| I. | The "Canary" | 1 |
| II. | Footprints in the Snow | 9 |
| III. | The Murder | 18 |
| IV. | The Print of a Hand | 34 |
| V. | The Bolted Door | 48 |
| VI. | A Call for Help | 58 |
| VII. | A Nameless Visitor | 67 |
| VIII. | The Invisible Murderer | 78 |
| IX. | The Pack in Full Cry | 87 |
| X. | A Forced Interview | 102 |
| XI. | Seeking Information | 114 |
| XII. | Circumstantial Evidence | 126 |
| XIII. | An Erstwhile Gallant | 136 |
| XIV. | Vance Outlines a Theory | 146 |
| XV. | Four Possibilities | 157 |
| XVI. | Significant Disclosures | 167 |
| XVII. | Checking an Alibi | 179 |
| XVIII. | The Trap | 190 |
| XIX. | The Doctor Explains | 200 |
| XX. | A Midnight Witness | 211 |
| XXI. | A Contradiction in Dates | 222 |
| XXII. | A Telephone Call | 234 |
