Yellow Brick War

Yellow Brick War by Danielle Paige is the third book in the Dorothy Must Die series. Amy Gumm is a girl from Kansas who, like Dorothy. gets swept away by a tornado and lands in Oz. But this Oz is different: Good is Wicked, Wicked is Good, and the Wicked Witches reveal her true calling—Assassin. Amy’s mission? To stop Dorothy from destroying both Oz and Kansas.