Every morning, Christine awakens beside an unfamiliar man in an unfamiliar bed. She sees an unfamiliar middle-aged face in the bathroom mirror. And every morning, the man patiently explains that he is Ben, her husband, that she is forty-seven years old, and that an accident long ago damaged her ability to remember.

In place of memories there is a handful of pictures, a whiteboard in the kitchen, and a journal hidden in a closet. Christine knows about the journal because Dr. Ed Nash, a neurologist who claims to be treating her without Ben’s knowledge, reminds her about it each day. Inside the notebook, the damaged woman has begun meticulously recording her daily events—sessions with Dr. Nash, snippets of information that Ben shares, flashes of her former self that briefly, miraculously appear.

But as the pages accumulate, inconsistencies begin to emerge, raising disturbing questions. Did she have a career? Was there a child? What happened to her bes