At our book club, someone mentioned it was like 50 First Dates, but a lot creepier. And that's basically true, the premise is used as a good device to keep things suspenseful. The "Don't trust Ben" bit was basically what carried me through the middle section of the book, but it was also written in a way that I kept wanting to see what happened next. I did guess the ending but not too early on, but I did have my suspicions. Actually, reading this ending and having the Little Bee ending so close in my mind does not work in its favour. It just seems like a common literary trope. Overall, though, it kept me reading and I enjoyed it.