Sparrow lives in the world after the Reek. The atmosphere is toxically polluted, and Axel Brodie, the tech billionaire behind Zephyr Industries, is cashing in as the only supplier of clean air. Sparrow is struggling to help her family survive until her brilliant inventor friend, Miriam Fenn, comes up with a new form of technology that could break Zephyr's stranglehold on the air supply. But men like Brodie are hard to defeat, and he will do everything in his power to stop Miriam and Sparrow. Who will triumph in this battle to breathe?