I really, really liked this book a lot. It was different from many of the romance books I've read, and I really enjoyed the mathematics that were involved in the story line. I was happy with how it ended. There were a few mistakes in the book...once it said sister instead of wife, and as instead of was, and compete instead of complete...those things kinda drive me crazy so that's my reason for not giving it a star rating. That might be nit-picky, but hey, it bothers me. I definitely recommend.