The stripper Rita is trying to blackmail her former lover, the wealthy Carlos Branco, threatening to reveal his illegal dope trade for the police. Branco responds by hiring the hit man Perkel, an eccentric technician, who has invented a sophisticated technical device for killing people at some distance with the help of a transmitter. Perkel sneaks into the Flamingo Club during daytime, and attaches a transistor to the microphone Rita is going to use in her act the same evening. Before the show starts there is a fierce quarrel between Rita and another girl, and Rita leaves the Club. Another stripper, Diana, has to replace her, and when she performs Rita’s act, she suddenly drops dead at the stage. A doctor investigates Diana’s body, and thinks there were natural causes for her death, probably a congenital heart defect. Diana’s husband Bert, who is the comic announcer between the acts of the show, cannot believe this. He is convinced that his 24 year old wife was murdered, although there is nothing that proves this at the moment. When Scotland Yard refuses to investigate the case, he starts the investigation himself.