In a mirror-lined room, Christian witnesses his father murdering his mistress. Years later, he returns to the family home with his fiancée, Helene, and Paul (his attorney) and Brigitte, a married couple who are close friends. Christian is troubled by the possibility that his father, who is believed to have committed suicide by jumping over a cliff, is still alive. Strange happenings, such as the discovery of his father's smoking pipe, lead him to assume that Paul is attempting to gain his fortune, but...