The beautiful O is taken by her boyfriend, Rene, to a bizarre retreat, where she is trained in bondage and sexual perversion. Rene discharges a personal debt by transferring possession of O to his step-brother, Sir Stephen. Rene takes his lover, the photographer O, to a manor in the isolated area of Roissy to be submitted to humiliations, bondage and sexual perversions to prove that she belongs to him. O spends several days being sexually abused by several men and whipped until she is ready to return to Rene. Then he shares O with his older step-brother Sir Stephen until Rene finally gives O to him. Meanwhile O and Sir Stephen fall in love with each other.