This book by Paul Hoffman is interesting and very dark book, Thomas Cale is the central character, a teenager raised by a violent and harsh religious sect the Redeemers, it appears to be a skilled killer. The story revolves around him and two other boys, plus a girl escaping their 'home' the Sanctuary, being chased, ending up in another city with Cale (no one calls him Thomas) falling in-love, killing quite a few people and... well I won't spoil the ending. What the Redeemers' plans for Cale are is not clear, but intriguing.
It is a good book that is a bit hard to categorise is it fantasy or alternative history? Some names of places are borrowed from real places and there is an Agincourt-style battle. I didn't think I was going to enjoy this book, but by the end I did and wanted to know what happens to Cale.