The Silver Chair (Chronicles of Narnia, Bk. 6)

Narnia . . . where giants wreak havoc . . . where evil weaves a spell . . . where enchantment rules. Through dangers untold and caverns deep and dark, a noble band of friends are sent to rescue a prince held captive. But their mission to Underland brings them face-to-face with an evil more beautiful and more deadly than they ever expected.