Imagine if sunlight burned you alive. In the near future, a mysterious solar event has transformed the sun's light into deadly immolating rays. The world's few survivors now live in nocturnal cities. But a killer who uses sunlight to burn his victims emerges, and when he targets the daughter of a solar power mogul, it falls to a disillusioned solar engineer to protect her.

In a world where sunlight burns people alive, Cielo Brandt, heiress of the city's most powerful company, and her savior David Baxter, have both survived a killer who didn't burn in the sunlight. Now, both want answers about his origins; Cielo investigates the city's underground and her father's company, while Bax braves the post-apocalyptic wasteland and the discovery of another who is immune to the sun's rays.