The only way to kill a god is from the inside ... The Gearbreakers struck a devastating blow against Godolia on Heavensday, but the cost of victory has been steep. Months later, the few rebels who've managed to escape the tyrannical empire's bloody retribution have fled to the mountains, hunted by the last Zenith—Godolia's only surviving leader. Eris has been held prisoner since the attack on the capital, which almost killed her. And she begins to wish it had when she discovers Sona—the girl she loves, the girl she would tear down cities for—also survived, only to be captured and corrupted by the Zenith. Cybernetic brainwashing has Sona believing herself a loyal soldier for Godolia, and Eris's mortal enemy. With the rebellion shattered and Godolia moving forward with an insidious plan to begin inducting Badlands children into a new Windup Pilot training program, the odds have never been more stacked against the Gearbreakers. Their last hope for victory will depend on whether Eris and Sona can somehow find their way back to each other from opposite sides of a war ...