The Bark of the Bog Owl (Wilderking Trilogy)
The whole Wilderking Trilogy is one you don't want your kids to miss. Start here, with The Bark of the Bog Owl. Ideal for kids 8-14, though you'll enjoy it every bit as much as your kids will. The less you know before reading it, the better, so try to skip reading reviews ahead of time, if you can!