The Three Impostors; or, The Transmutations is an episodic horror novel by British writer Arthur Machen. The novel comprises several weird tales and culminates in a denouement of deadly horror, connected with a secret society devoted to debauched pagan rites. The three impostors of the title are members of this society who weave a web of deception in the streets of London-relating the aforementioned weird tales in the process-as they search for a missing Roman coin commemorating an infamous orgy by the Emperor Tiberius and close in on their prey: "the young man with spectacles"

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