One day, William is summoned from the hunt to the house by a servant who claims Eugenia wants him. Entering the bedroom, he finds Eugenia and Edgar engaging in incestuous sex. Eugenia confesses that this has occurred since childhood and that her fiancé committed suicide in consequence. She says that when it started she was too young to understand but, after she saw herself through the eyes of her fiancé, she felt guilty. In tears, Eugenia explains that she tried to stop, but that Edgar's will was too strong. William realises that he has been used to conceal the incest and that the children (who bear no resemblance to him) are Edgar's.