The Adventures of Sherlock Holmes and Dr. Watson: King of Blackmailers

After upsetting the criminal underground in 'the Master Blackmailer' case, Sherlock Holmes has to face his archenemy: Prof. Moriarty.

Holmes receives a message from Inspector Gregson about a strange case in an abandoned house on Brixton Road: the body of an elderly American was found there, and the word "Revenge" is written in blood on the wall.

Faced with two false confessions and numerous suspects after a despised civil magistrate is found shot in the local vicarage, Detective Inspector Slack reluctantly accepts help from Miss Marple.

While on vacation at a resort hotel in the West Indies, Miss Marple correctly suspects that the apparently natural death of a retired British major is actually the work of a murderer planning yet another killing.

Early in his crime-solving career, Sherlock Holmes attempts to prevent Moriarty from cornering the heroin market.