To better understand Howl’s Moving Castle it helps to understand it’s origins. Howl’s Moving Castle was the first book in a series written by Diana Wynne Jones in the 1980’s. The books go into depth on several subjects the movie barely touches on or offers in what could be considered a hurried fashion. The books are worthwhile and prove to be very complimentary to the film. Fear not, the books are not required reading as the movie is otherwise an extensive reworking by the one and only Miyazaki-sama.