Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Riveting...( 4 1/2 stars)

Wow. What a book . I can safely say that this is unlike any other "timetravel" book that Ive gotten my hands on. I enjoyed it immensely. I will say that it could be a bit shocking in its explicitness...so, it may not be for everyone. Why not 5 stars? Well, I loved Elaine..and I found Charles to be fantastically sexy..I liked him even when I hated him. However, I wanted to get into his head a little more..I wanted him to soften up a bit sometimes. I will say though that I can understand his hesitancy to let his guard down due to some of his previous experiences with his wife. My only other quibble was that I felt there were a few things that were left without enough explanation, but I loved this book regardless and it has definitely made my keepers list.