I don't want to be overly critical of this book, because for me it was a pleasant and easy to read for the most part. However, I despise the Dov character more than I have ever any other antagonist. When I thought I had read past his heinousness, there was more, and honestly I almost DNFed for that alone.
Nonetheless, if you ignore him, the book is actually enjoyable and the first half was very promising... As other people have noted here, the second half was not as good. I still went on hoping it would get better and it did not disappoint me per se, but it didn't deliver either. Sadie had become pretty annoying by that point, for no apparent reason (she thinks that she has suffered the worst pain in the world and that everyone else is responsible), and the final pages didn't help to absolve her.
In general, I would not recommend it but it's still an okay book.