Year: 1975
Country of production: France, West Germany, Canada
Original language: French
Genre: Erotic
Video: Color

A young photographer, always and only known by the initial of her name, "O", is led by her lover René to a castle, where she will be subjected to sadomasochistic rituals, until she is transformed into a pure and simple sexual object. Here she learns all the secrets of the art of sex and voluntary submission. At the end of her initiatory stay, before leaving, she is given an iron ring that she must always wear and that identifies her as a slave.