Christine wakes up every morning in an unfamiliar bed with an unfamiliar man. She looks in the mirror and sees an unfamiliar, middle-aged face. And every morning, the man she has woken up with must explain that he is Ben, he is her husband, she is forty-seven years old, and a terrible accident two decades earlier decimated her ability to form new memories. But it's the phone call from a Dr. Nash, a neurologist who claims to be working with Christine without her husband's knowledge, that directs her to her journal, hidden in the back of her closet. For the past few weeks, Christine has been recording her daily activities -- tearful mornings with Ben, sessions with Dr. Nash, flashes of scenes from her former life -- and rereading past entries, relearning the facts of her life as retold by the husband she is completely dependent upon. As the entries build up, Christine asks many questions. What was life like before the accident? Why did she and Ben never have a child? What has happened to Christine's best friend? And what exactly was the horrific accident that caused such a profound loss of memory? Every day, Christine must begin again the reconstruction of her past. And the closer she gets to the truth, the more unbelievable it seems.