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Spies of the Kaiser: Plotting the Downfall of England
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The Place of Dragons: A Mystery
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The Veiled Man
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The Mystery of the Green Ray
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The Great White Queen: A Tale of Treasure and Treason
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The Seven Secrets
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Whither Thou Goest
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The Count's Chauffeur
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Whatsoever a Man Soweth
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The Temptress
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Her Royal Highness: A Romance of the Chancelleries of Europe
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The Lost Million
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The Red Room
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The Mysterious Mr. Miller
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The Pauper of Park Lane
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The Great God Gold
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In White Raiment
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Devil's Dice
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An Eye for an Eye
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Hushed Up! A Mystery of London
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The Broken Thread
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The House of Whispers
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If Sinners Entice Thee
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As We Forgive Them
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Behind the Throne
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Guilty Bonds
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The Mysterious Three
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The Wiles of the Wicked
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The Bond of Black
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The Sign of the Stranger
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The Bomb-Makers
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The Four Faces: A Mystery
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The Hunchback of Westminster
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Mademoiselle of Monte Carlo
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The Stolen Statesman: Being the Story of a Hushed Up Mystery