The Tin Man by Kailin Gow

I am known as the Tin Man, because I have no heart.
I have no qualms about doing the things that I do. I was sent to complete a mission which involved a young woman. She changed me, and that changed everything. Including who and what I am.
I was the Tin Man, and in order for me to live, for her to live, I must take them down. The Inner Circle, aka Oz.
Which means I must take down all the players in Oz, including the Lion, The Scarecrow, Dorothy, and the Wizard.
This is not the Wonderland you read about in fairy tales, but a dark bad place. Before you go, remember to bring an Ax.