Slim (Bud Abbott) and Tubby (Lou Costello) are American cops in London studying police tactics. A newspaper reporter, Bruce Adams (Craig Stevens), gets into an altercation at Hyde Park that was instigated by Vicky Edwards (Helen Westcott), a suffragette. Bruce and Vicky wind up in jail, while Slim and Tubby are kicked off the police force. Dr. Henry Jekyll, Vicky's guardian, bails them out.