The monster in the hollows

Andrew Peterson, 1974-

Book - 2011

Janner Wingfeather's father was the High King of Anniera, but his father is gone. The kingdom has fallen, the royal family is on the run, and the Fang armies of Gnag the Nameless are close behind. Janner and his family seek refuge in the last safe place in the world, the Green Hollows. But there's a big problem. Janner's little brother--heir to the throne of Anniera--has grown a tail. And gray fur ...