Al Pereira arrives at the "House of Vice" and receives orders to stop spying on three women and a man, known as the Quadriumvirate, who deal in prostitution and drugs. When Lina Gordon hires him to find an envelope, Pereira discovers that Lina is in fact a man who has undergone an operation. Disgusted, he kills her.
| Production | Robert de Nesle | Producer |
| Directing | Jesús Franco | Director |
| Writing | Elisabeth Ledu de Nesle | Screenplay |