The freshly graduated psychiatrist David shall deliver an opinion about young Maddalena, whos on trial for murdering a hunter. She claims shes a witch and acted on behalf of the devil. The public health officer tells David, hes got reason to believe her, that shed been searching for a man who suits her needs for 300 years. Already after his first meeting with Maddalena, David begins to change: He ignores his beautiful young wife Cristina and loses himself in daydreams and hallucinations in which he participates in Inquisition questioning and erotic witches circles.