On Valentine's Day, Sherry finds an anonymous note in her mailbox: be mine. As the notes continue, Sherry becomes more and more charged by the idea that she can inspire such feelings. Her twenty-year marriage is routine and she feels old, aimless, and empty now that her son is in college. When she discovers who her admirer is, she begins a wildly passionate affair with him. But her son's childhood friend is witness to the affair, her best friend...