The frozen wasteland of Snow World – known as Southern California before an alien invasion decimated civilization – is home to warring steampunk clans. Crankshafts, Imperials, Tinskins, Brineboilers, and many more all battle each other for precious products, against ravenous mutant beasts for simple survival, and with the secret Founders for his or her very freedom. Through this ruined globe soars the Pneumatic Zeppelin, captained with the daring Romulus Buckle. In the wake of the almost suicidal about Romulus Buckle & the Motors of Battle assault in the Founders’ jail city to save key military market leaders, both the steam-powered airship and its staff are bruised and battered. Yet there’s short amount of time for rest or fixes: Founders raids threaten to shatter the fragile alliance Buckle has risked everything to forge among the clans. Even as he musters what seems a futile protection when confronted with inevitable battle, Buckle learns the fact that most inexplicable clan of all is keeping his long-lost sister inside a key base – and that she holds the ultimate key to success on the Founders. But rescuing her means abandoning his allies and praying they survive lengthy more than enough for there to be an alliance to come back to.