Earth is a scorched, waterless tomb. Humanity has retreated into the deep, clinging to life in a rigid underground caste system where "leveling up" is the only religion. For Captain Jason Bjorn, a smuggler with a mysterious past, survival means earning enough credits to buy the enhanced DNA and social standing required to ascend to the city’s elite upper tiers.To fund his climb, Jason accepts a suicide mission: hauling illegal nuclear power rods through the dry, treacherous surface...