London, 1895, and a gentleman comes calling at 221B Baker Street. Benjamin Nichols' daughter Hannah has become estranged from him, and has disappeared. Holmes and Watson soon discover that Hannah has joined a religious sect known as the Elysians, three members of which have recently turned up dead. Were these deaths tragic accidents, as the police suspect, or something more sinister? Only by infiltrating the cult will the companions discover the terrifying truth...