Katie Wilkinson has finally found the perfect man — but one day he suddenly disappears, leaving behind only a diary written by a new mother named Suzanne for her baby, Nicholas. In it she intimately reveals the romance between herself and the child's father, her hopes for their marriage, and her unparalleled joy in motherhood. As Katie reads on, she realizes that the man she loves is Suzanne's husband. Now, filled with terror and hope, Katie must struggle to understand what has happened — and find out if her new love has a prayer of surviving.