On the run from bullies at school, Eustace and his friend Jill suddenly find themselves in the enchanted land of Narnia. Prince Rilian, son of the old and frail King Caspian, has disappeared mysteriously and Eustace and Jill are called upon to help. Aslan, the great lion, sends the children on a quest through treacherous lands of witches and giants to locate Prince Rilian, heir to the Narnia throne, and bring him home. The Emerald Witch who rules the underworld will ensure that this is no easy feat.