I ordered the book so I could figure out the story but soon realized that the play doesn't not quite follow the book. OK, it really doesn't follow it all. I finally had to google for a synopsis so I could figure out the play as compared to the novel. I was surprised and a bit disappointed to find that Elphaba does not die in the play. But I had only read about 2/3 of the book at that point and figured she still had time to turn Wicked! She never did become evil, a bit manic and mad but I would be hard pressed to stay sober and rational if I knew a little girl with magic shoes had been sent to kill me.
I wish the book would have cleared up a few other things like who is/was Yackle. But perhaps Son of a Witch will had the answer.