Amy Gumm is the other girl from Kansas. When a tornado sweeps up her trailer and dumps it in Oz, Amy realizes that the books don't tell you the who story.
Something is wrong in Oz. Good Witches can't be trusted, Wicked Witches may actually be trustworthy, and the winged monkey can be executed for rebellion. Dorothy made it out of Oz, but then she came back. She seized power and has started to corrupt Oz. No one is safe.
Amy gets recruited by the Revolutionary Order of the Wicked. And she's given a mission:
-REMOVE the Tin Woodman's Heart
-STEAL the Scarecrow's Brain -TAKE the Lion's courage and then: Dorothy Must Die