Dread Mountain

"The Shadow Lord dominates the land of Deltora. Only Lief, Barda, and Jasmine can save it from his evil powers. To do this, they must restore all seven gems to the magic Belt of Deltora. Four gems have been found. To find the fifth stone, the heroes must venture to the edge of the Shadowlands and enter the dark and terrifying realm of the monster Gellik." — from the book's back cover copy.