Scotland Yard is after a homicidal maniac called The Blue Hand, which is what he uses to kill his victims.
The sister of a famous, but as yet uncaught, criminal named The Hexer is murdered. Inspector Higgins of Scotland Yard believes that The Hexer will surface to take his revenge on his sister's killers, and plans to set a trap to finally capture him. However, soon bodies start piling up, and it looks as if The Hexer may get away yet again.
