In this nasty drama, a 17th-century Italian nun's long repressed sexual passion is awakened when a handsome nobleman rapes her. Confused by her unholy emotions, the nun sees that the aristocrat is arrested. Unfortunately, the louse impregnated her and shortly after bearing his child, she helps him escape from prison. Reunited, the two embark upon a passionate affair. One day another nun sees the two making love. Unfortunately, she dies before she can tell anyone. Later the offending nun is captured and given a life sentence for having sex and helping to murder her colleague.