Out of Oz--9/10 Almost as good as Wicked. If you're a fan of the Wicked Years series, or just Wicked, definitely check this one out. It's bittersweet and poignant, and if you're read any Baum Oz books other than The Wizard of Oz, you can see how much Maguire incorporates from that world. Maguire doesn't take everything from Baum's world, and he adds a lot from his own imagination, but it still manages to be Oz. But Oz for cynics and romantics (in the Roland of Gilead sense, if you know what I mean).
Maguire also has a wicked wit, imo. Even in the tenser moments of the book, he made me laugh at some witticism from a character. A well-written book all around.