Howl's Moving Castle by Diana Wynne Jones (Which is now an animated film by Miyazaki -- for those not in the know he is Japan's version of Walt Disney).
As with all her works, Howl's is a quick read which draws you into the world almost immediately, and was a lot of fun. We follow the adventures of Sophie, the oldest of three, who is sure she will never amount to anything because everyone knows it is the youngest siblings who become rich or have adventures. Yet a chance meeting and a case of mistaken identity will find Sophie cursed and out in the world cavorting with dangerous witches and wizards.
The animated film closely follows most of the major components and the feel of the book and characters, but expect some deviations. I loved both!