Two sisters visit a doctor's home to rescue one's sibling from his control. He proposes a series of erotic tests for them to prove their willpower and free her, forcing them into sexual acts with him and each other.

When Ellen and Dawn arrive in Italy in search of Ellen's sister Katherine, they wind up in the looming, gothic home of Ivan, a doctor who has broken Katherine's will and controls her completely. Ellen is ready to fight Ivan to get her sister away from this man and he, surprisingly, doesn't object but only if Ellen can prove her own will to be stronger than his. The women are then put to a series of increasingly erotic tests, forced to pleasure Ivan and each other, with Katherine's body and soul hanging in the balance. Can Ellen and Dawn beat the manipulative, evil Ivan at his own maniacal, carnal game and escape his sexual house of horrors?