Susanna (Eva Grimaldi), a young girl is raped by her own father and sent to a convent for her sins. There she finds soon out, that life behind the convent walls can be quite exciting. She has a steamy sensual relationship with Mother Superior, assorted lesbian encounters with other nuns and a sacrilegious sexual relationship with the young Father Confessor of the convent. This, however, unchains the jealousy and angriness of the other nuns, lead by the Vice-Mother Superior, who "has plans" for Susanna. Repeatedly rejected, she accuses Susanna of being possessed by the Devil and manages to send her to trial before the Archbishop where she is tortured and exorcised...