I read those books. They were quite a slog for me to get through actually, I didn't enjoy them half as much as I wanted to. Hardly a sympathetic character among them and nothing much at all happened in the first book. The third book was certainly the best but still a bit, meh.
But yeah, they could seriously do with a map in them. Hard to visualise where everything is in the books and the guy who drew that must have taken a lot of licence when drawing it.