First let me say that I found this book interesting and convincing; I considered giving it 5 stars.
Second, let me say that if you are looking at this book because you read the highly popular book "Evolution: The Triumph of an Idea" and you are hoping that this similarly named book is similar in presentation and content, beware — it is not. Carl Zimmer's book on evolution is a beautifully illustrated, highly readable book for the masses; this book is not. If you are not already well-versed on the mechanics of evolution, or for some reason can't accept them, then it seems unlikely that you will truly understand this book