The Chronicles of Narnia Vol IV: The Silver Chair

The Silver Chair opens with the Great Lion Aslan’s calling of Eustace back to Narnia. Together with his classmate Jill Pole, Eustace is given four signs to search for Prince Rilian, Caspian's son, who has disappeared ten years ago in the journey to avenge his mother's death. The two boys’ mission to find Rilian in Underland face danger and betrayal. But most deadly is they come face-to-face with an evil more beautiful than they ever expected.