I'm not going to beat a dead horse here, but I did not like this book at all. 1-1/2 stars overall, the extra "half" because I like the simplicity of the writing style. 
 But nothing happens in this book. Nina seeks revenge on Emma for something that happened years ago (which we don't learn the details of until the end), and she weasels her way into Emma's life to destroy her. But it's petty jealousy, and not very interesting. The reason for her hatred is baseless, and not worth the twenty-some-odd years that Nina has been dwelling over it. 
 Plus, both their husbands are pretty much dumb and useless. And there are a whole slew of characters whose names you think you have to keep track of, but their only role is filler so it doesn't matter that you can't remember them. 
 This was wholly unsatisfying and unrecommended.