One of five adaptations of the Marquis de Sade's Philosophy in the Boudoir directed by cult filmmaker Jesus Franco, this version was perhaps the most subdued, although it was still explicit enough to encounter censorship problems. Maria Rohm stars as Mme. de St. Ange, who reads the Marquis' book and fantasizes about its excessive content. St. Ange has sex with a man named Mistival (Paul Muller) in exchange for permission to take his lovely daughter Eugenie (Marie Liljedahl) to her vacation island. When they arrive, St. Ange and her lover Mirvel (Jack Taylor) seduce Eugenie into joining their bizarre sexual role-playing. A party follows, during which Eugenie is drugged and forced to submit to sadomasochistic games directed by Dolmance (Christopher Lee) and his oddly-dressed followers. When she awakens from her stupor, however, Eugenie finds that the games have turned to murder. Nino Korda and Herbert Fuchs co-star in this provocative exploitation film. Christopher Lee's role as the narrator Dolmance was originally accepted by George Sanders, whose personal crises forced him to withdraw prior to production. Franco returned to the same source material for Eugenie de Sade (1970), Plaisir a Trois (1973), Cocktail Special (1978), and Eugenie, Historia de Una Perversion (1980).