Yellow Brick War

Book 3 in the Dorothy Must Die series written by Danielle Paige.

I'm The Other Girl From Kansas. And I Have A Job To Do. 

Join The Witches.

Fight For Oz. 

Kill Dorothy.

Stop A Yellow Brick War. 

The Dorothy Must Die series is an alternate Oz book series by Danielle Paige that features a new girl from Kansas named Amy Gumm. Amy must go up against an evil Dorothy Gale who has taken over the Land of Oz and rules it with an iron fist along with her three companions.