Title: Howl's Moving Castle (Howl's Castle Series #1), Author: Diana Wynne Jones
Title: Castle in the Air (Howl's Castle Series #2), Author: Diana Wynne Jones
Title: House of Many Ways (Howl's Castle Series #3), Author: Diana Wynne Jones
Title: World of Howl Collection: Howl's Moving Castle, House of Many Ways, Castle in the Air, Author: Diana Wynne Jones