Okay, I finally got my hands on the original first book. I was stunned that I could enjoy it even more than the anime movie. As ususal, there's a ton of stuff that make great impacts on the storyline missing from the movie. Trust me this an enthralling read that's sure to keep your interest and surprise you at every turn. The action sequences defy your view of Howl and the entire background makes Howl a far more interesting character with even more flaws than depicted by Hayao Miyazaki. Also, Sophie's role is far more clear and her motives make a good deal more sense.
Over all, I believe that this is a worthwhile read for anyone over twelve.