William James Moriarty, future nemesis of Sherlock Holmes, lives in late 19th century London. William learns of a serial killer who has murdered seven young boys and immediately deduces from their fathers' occupations the killer is a nobleman who encountered the boys at their fathers' shops, except for one boy who was homeless. After interviewing the homeless boy's friend, William deduces the killer must have first seen the boy from a window of the Gastros fine dining club. William's brother, Albert, uses his connections to get William inside the club...