Diana Wynne Jones

Although an orphan, Earwig has always enjoyed living at St. Morwald's, where she manages to make everyone do her bidding, but when she is taken in by a foster parents who are actually a witch and a demon, she has a hard time trying to turn the situation to her advantage.

A young woman named Sophie is cursed by the Witch of the Waste and is turned into an old woman who is unable to tell anyone of her plight. Unable to continue her job at her mother's hat shop, she goes to the ambulatory castle of the notorious wizard Howl and insinuates herself into his household. Sophie befriends Calcifer, the fire demon who powers the castle and who is bound to Howl by a contract, the terms of which Calcifer cannot reveal. They promise...