'The Silver Chair' by CS Lewis is a children's novel in the Narnia series. Eustace and Jill escape from the school bullies through a magical door in the wall. In Narnia, Aslan the Lion has a job for them; to find and bring back The Lost Prince to Narnia. He also gives them detailed instructions, and they pursue the quest with vigour, through deep recesses and dark caverns, in order to rescue Prince Rillian. Finally, they face the evil witch that must be defeated ...