Haunted by childhood loss, 23-year-old Louise takes on her late mother's name and sets out to find Nicholas, the man she has always held responsible for her mother's death. Now a middle-aged lecturer, husband and father, Nicholas has nevertheless been unable to shake off the events of his past, when he and Louise's mother, Lydia, had a clandestine, destructive and ultimately tragic affair. As Louise infiltrates his life and the lives of his family, she forms close and intimate relationships with both his son and his wife, but her true identity remains unknown to Nicholas himself. Tensions grow and outward appearances begin to crack, as Louise and Nicholas both discover painful truths about their own lives, each other and the woman they both loved.