The Chronicles of Narnia: The Silver Chair

On the run from bullies at school, Eustace and his friend, Jill, suddenly find themselves in Narnia. Prince Rilian, son of the old and frail King Caspian, has disappeared mysteriously. Aslan, the Great Lion, sends the children on a dangerous quest through treacherous lands of witches and giants to locate the Prince, only heir to the Narnian throne. But the Emerald Witch who rules the underworld will ensure bringing him home is no easy feat.