The Crown of Dalemark: Book Four of the Dalemark Quartet - Diana Wynne Jones
I liked this one better than the first three in the series. There were a few things I wasn't completely happy about, but all in all, this book made me realize why some people like this series so much. I'd like to have seen more of Biffa, Kialan and Moril and his siblings, but I'm not complaining (much).