I heard amazing things about this book, how it tells the story of Elphaba prior to Dorothy and what caused her to become who she was. It's an interesting perspective because it puts a very humanizing spin on the Wicked Witch of the West. 
 I would definitely recommend this book to lovers of the Wizard of Oz, but there is one caveat. For myself, I don't particularly like the writing style all the way through. A lot of it is creative and amazing, but a lot of other parts I just don't quite buy. Perhaps it's because a lot of it is way too nonsensical that it breaks the flow of the story. Perhaps it's because the narrator goes into so much detail about events and history, but it feels mediocre at best. 
 I'm really on the fence about this one. The writing is either very good or very bad, so I can't really give it more than a 3. But I suggest if you haven't read this yet, to read it for yourself and see how you like it because I know a lot of people love this book.