Professor Heitz hears a female voice and goes outside. The full moon appears and he goes to the castle where he glimpses a green figure. He staggers back to the house and writes a letter to his son before he turns to stone. Paul arrives but is not allowed to see his father's body. Namaroff has attributed his death to heart failure but Paul does not believe him. Carla tells Paul that Megaera the Gorgon does exist. At the hospital, Carla tells Namaroff what she has learned about the Gorgon from Professor's Heitz' letter to Paul, which she read at his house. Ratoff, an orderly, comes in and reports that Martha, a mentally disturbed patient, has escaped again. Namaroff tells Carla that Megaera has taken on human form.