Monster in the HollowsMonster in the Hollows by Andrew Peterson follows the adventures of Janner, Tink, and Leeli Igiby, the Lost Jewels of Anniera, as they hide from Gnag the Nameless in the Green Hollows. This is one of the few places in the land of Aerwiar not overrun by the Fangs of Dang. However, there's a significant problem. Janner's little brother, who is the heir to the throne of Anniera, has sprouted a tail, grey fur, two pointed ears, and long, dangerous fangs.