Cyrus Venn, a young member of the Aetherbound—the lowest class of the Solaris Dominion—works tirelessly to maintain the energy core that powers the empire, trapped in a life of servitude. Desperate to escape the oppressive undercity, Cyrus joins a group of rebels with a plan to break free. But when a trusted ally betrays them, Cyrus is thrown into a new and dangerous world.