This book was on my TBR pile for a while. It's an Oprah book, described as a "gripping psychological thriller". I do agree, the book is very interesting, it starts with "Ruth remembered drowning", the story develops from there, little details are added and you get more and more into the characters and their relations. Although toward the end you can imagine what is going to happen (or what has happened), it's still fascinating, you want to know how it goes on. The characters are well described, you find you could know them in real life and you imagine whom you would like and whom you wouldn't. They have both positive and negative sides which makes them more alive.
I am an Oprah book fan, haven't found one so far that I didn't like (didn't read them all, though). I know some of my friends find them too American, maybe they are but I don't mind that, I read different stories about people in different parts of the world all the time.