The Last Battle (Chronicles of Narnia, Bk. 7) by Lewis, C. S.

Narnia . . . where lies breed fear . . . where loyalty is tested . . . where all hope seems lost. During the last days of Narnia, the land faces its fiercest challenge - not an invader from without but an enemy from within. Lies and treachery have taken root, and only the king and a small band of loyal followers can prevent the destruction of all they hold dear in this, the magnificent ending to The Chronicles of Narnia.