I enjoyed this one. When I bought it at the store, I didn't even know it was a part of the Circle books, so that was a nice surprise. Now I need to get the other two in this set (Saint and Showdown) to get the full story of the three main characters. I must say though that the ending left me wondering. I'm not sure exactly where in the Circle timeline these fit. I mean, I have an idea of the general timeline, but specifically, did this take place before or after Green? I have a feeling that Sinner took place after due to the ending, but I'm just not sure... Good read and I highly recommend all of these Books of History Chronicles!