 The novel comprises several weird tales and culminates in a final 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