Another of GM's books that is definitely NOT for children. There are a few really creepy/icky parts in this book that I could have done without (in the city of Oz), but on the whole it was unique and fun, a very different and curious take on the classic story. I have NOT seen the musical, but I can tell you from photos I've seen that the sister "wicked witch" seems to be quite different in the musical than the book. STOP reading here if you don't want minor spoilers.... If you loved the classic Oz story, you may find some of the character changes offensive. Dorothy, at least in the book, is portrayed as an insipid idiot. The Wizard is evil, and Glinda is full of herself. If you are willing to accept these as another possible point of view, read it and enjoy it!
An interesting book.
Most of the book is from the point of view of the people around the Wicked Witch of the West. Those around her don't understand her It is only in the last section that we see things from her point of view. I wish that we saw more of the book from her point of view instead of those around her.