Wealthy children's author Cathryn (Susannah York) receives a series of disturbing phone calls in her home in London one dreary night; the female voice on the other end, sometimes cutting in on other phone conversations, suggests mockingly that her husband Hugh (René Auberjonois) is having an affair. Hugh comes home, finding Cathryn in distress. As Hugh attempts to comfort her, Cathryn witnesses a different man who is behaving as if he were her husband. She screams in horror and backs away, only to see her vision of the figure revert to her husband.