Yellow Brick War by Danielle Paige (Dorothy Must Die Series, book 3)

I gotta tell you, this book seems more like a vehicle to get from book 2 to book 4. I don't really remember much about it except that Amy has returned to Flat Hill Kansas and is looking for the first pair of Dorothy's magic shoes (apparently the ruby slippers were her second pair that Glinda used to bring her back to Kansas after returning home). 

Amy has returned to her mother, who seems to be doing better without her, but is eager to make up for lost time. She also returns to high school, with Madison, now a mother, and no longer queen bee at the school. Together with Madison and Madison's baby daddy Dustin, they search the high school for Dorothy's first pair of magic shoes. 

I think this book isn't as memorable because half of it takes place in Kansas, where Amy cannot use her magic. A lot of the world-building from the first two books is missing in book 3. And while we get glimpses of characters in Oz, it's really just that. Brief glimpses.

The second half is a return to Oz and another battle between the good and the wicked. I think it all starts to run together by this point.

Having said that, I'm invested in the story and was eager to read it each time I picked it up. It just didn't have the surprises of book 1 or the adventures of book 2. Amy had a very focused task in Kansas and returned to another great battle, both of which set up the story for book 4.