Rival window cleaners Willy I and Willy 2 befriend Jou-Jou, an aspiring dancer, who has been tricked out of money by a con-man posing as an American movie mogul, and together they turn an old railway carriage into a "Villa Hollywood" for her.
As the police intensify their bemusing search on Doctor Mabuse's notorious band of gangsters, the deceptive, elusive hypnotist Mabuse simultaneously begins to close in on himself.
Doctor Mabuse is a criminal mastermind, doctor of psychology, and master of disguise, armed with the powers of hypnosis and mind control, who oversees the counterfeiting and gambling rackets of the Berlin underworld. He visits gambling dens by night under various guises and aliases, using the power of suggestion to win at cards and finance his plans.
Dr. Mabuse and his organization of criminals are in the process of completing their latest scheme, a theft of information that will allow Mabuse to make huge profits on the stock exchange. Afterwards, Mabuse disguises himself and attends the Folies Bergères show, where Cara Carozza, the main attraction of the show, passes him information on Mabuse's next intended victim, the young millionaire Edgar Hull. Mabuse then uses psychic manipulation to lure Hull into a card game where he loses heavily. When Police Commissioner von Wenk begins an investigation of this mysterious crime spree, he has little to go on, and he needs to find someone who can help him.
