Prologue

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Introduces Oswald De Gex

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The Sister's Story

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Who Was Gabrielle Engledue?

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Facing the Music

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The City of the Lilly

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Another Puzzle

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The Millionaire's Apprehensions

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Little Mrs. Cullerton

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Some Plain Speaking

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Monsieur Suzor Again

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The Absolute Facts

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Red, Green, and Gold

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Some Interesting Revelations

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The Gate of the Sun

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The Intruder

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Another Strange Disclosure

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What the Professor Found

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More About the Mystery Man

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The Track of Despujol

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Mademoiselle Jacquelot

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At the Hotel Luxembourgh

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Gabrielle at Home

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The Death Drug

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Yet Another Mystery

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What the Valet Knew

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More About Mateo Sanz

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A Curious Story

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Love the Conqueror

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Another Plot

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Conclusion

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