| CHAPTER | | PAGE | | Prologue | 11 | | I. | Introduces Oswald De Gex | 20 | | II. | The Sister’s Story | 37 | | III. | Who Was Gabrielle Engledue? | 48 | | IV. | Facing the Music | 59 | | V. | The City of the Lily | 69 | | VI. | Another Puzzle | 80 | | VII. | The Millionaire’s Apprehensions | 91 | | VIII. | Little Mrs. Cullerton | 102 | | IX. | Some Plain Speaking | 113 | | X. | Monsieur Suzor Again | 122 | | XI. | The Absolute Facts | 132 | | XII. | “Red, Green and Gold!” | 143 | | XIII. | Some Interesting Revelations | 153 | | XIV. | The Gate of the Sun | 163 | | XV. | The Intruder | 172 | | XVI. | Another Strange Disclosure | 182 | | XVII. | What the Professor Found | 192 | | XVIII. | More About the Mystery-man | 202 | | XIX. | The Track of Despujol | 212 | | XX. | Mademoiselle Jacquelot | 222 | | XXI. | At the HÔtel Luxembourg | 232 | | XXII. | Gabrielle at Home | 243 | | XXIII. | The Death-Drug | 253 | | XXIV. | Yet Another Mystery | 263 | | XXV. | What the Valet Knew | 272 | | XXVI. | More About Mateo Sanz | 284 | | XXVII. | A Curious Story | 293 | | XXVIII. | Love the Conqueror | 299 | | XXIX. | Another Plot | 311 | | Conclusion | 316 |
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