As the Mother Superior's tuberculosis grows stronger, Theresa takes temporary command of the monastery and abuses her power to make Susanna's life a living hell.

Theresa spreads a rumor that Susanna is possessed by the Devil, and locks her in a rat-infested dungeon, then tricks the poor girl into drinking a substance that makes her feverish.

She later orders some of the nuns to drag Susanna naked from her bed and whips her violently, claiming she is just trying to beat the Devil out of her.

The Monsignor hears word that one of the local nuns is demonically possessed and decides to investigate.

At Theresa's behest, an exorcist even subjects Susanna to a douche by means of a vaginal syringe filled with holy water to clean the Devil from her body.