Spanish director Jésus Franco directs this controversial sado-masochistic drama, regarded by many as his masterpiece. Based on the novel 'Philosophy in the Boudoir' by Marquis De Sade, the film tells the story of an innocent young woman, Eugenie (Marie Liljedahl), who is taken by her father (Franco regular Jack Taylor) to stay at an island paradise at the request of the elegant Madame de Saint Ange (Maria Rohm), with whom he is obsessed. There, Eugenie becomes the unwitting pawn in a game of sexual debauchery and sadomasochistic pleasure as the enigmatic hostess and her stepbrother conspire to corrupt her, transforming her from a virginal innocent into a sexually-charged, drug-addicted sadist.