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**The Fellowship of the Frog
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*The Red Circle
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*The Terrible People
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**Dead Eyes of London
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*The Devil’s Daffodil
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*The Forger of London
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*The Green Archer
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*The Strange Countess
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*The Door with Seven Locks
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*The Inn on the River
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***The Secret of the Red Orchid
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*The Black Abbot
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*The Indian Scarf
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*The Squeaker
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*The Curse of the Hidden Vault
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*The Mysterious Magician
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*Room 13
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*Traitor’s Gate
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*Again the Ringer
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*The Sinister Monk
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*The Hunchback of Soho
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*The Trygon Factor
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***The College Girl Murders
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**Creature with the Blue Hand
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*Gorilla Gang
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*The Monster of Blackwood Castle
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*The Zombie Walks
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***Double Face
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*The Man with the Glass Eye
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*Angels of Terror
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***Seven Blood-Stained Orchids
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***What Have You Done to Solange?
32 titles