OK, this is going to be the last 'relationship thriller' for a while i think - this was one too many! This is an obsessive and unsettling book, in which a middle aged and very proper American school headmaster is apparently confessing to some horrific crime, but as the novel progresses the reader learns just how unreliable the narrator really is. It's a dark and compelling book, with a significant twist part way through, and it becomes quite a different book, about different things..but for me it unravelled a bit at that point. I don't think every reader would find that; I can see how it could convince many, but I was left a little flat. Still, if you liked Gone Girl, you would probably like this too.