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CONTENTS
| CHAPTER | PAGE | |
| XVI | Strange Phenomenon of the Dissociation of Matter | 180 |
| XVII | The Inexplicable Gallery | 184 |
| XVIII | Rouletabille Has Drawn a Circle Between the Two Bumps on his Forehead | 194 |
| XIX | Rouletabille Invites me to Breakfast at the Donjon Inn | 197 |
| XX | An Act of Mademoiselle Stangerson | 213 |
| XXI | On the Watch | 219 |
| XXII | The Incredible Body | 230 |
| XXIII | The Double Scent | 235 |
| XXIV | Rouletabille Knows the Two Halves of the Murderer | 239 |
| XXV | Rouletabille Goes on a Journey | 249 |
| XXVI | In which Joseph Rouletabille is Awaited with Impatience | 251 |
| XXVII | In which Joseph Rouletabille Appears in all his Glory | 261 |
| XXVIII | In which it is Proved That one does not Always Think of Everything | 295 |
| XXIX | The Mystery of Mademoiselle Stangerson | 300 |
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