From the book's website:

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 and rereading past entries, relearning the facts of her life as retold by the husband she is completely dependent upon.

Every day, Christine must begin again the reconstruction of her past. And the closer she gets to the truth, the more un- believable it seems.

What happens when you've lost your memory and must begin every day without remembering the day before it? This is what's happened to Christine Lucas. The prospect seems disturbing, even horrible, at first, but as the book goes on you realize that it's truly terrifying.

If I had one criticism of this book, I'd say it wasn't fast paced enough, but then I generally read novels so fast paced I find myself gasping for breath. By comparison, this one moves relatively slow. However, it is full of suspense, and I quickly became completely invested in Christine, rooting for her to regain her memory, or at least understand what had happened to her. Ultimately, it's a thoroughly satisfying read.

I gave Before I Go to Sleep 5 stars on GoodReads.