The end of the world is only just the beginning. So eighteen-year-old Thea discovers when her solitary life on a dying Earth is shattered by a mysterious dream, a devastating choice, and a strange gift that propels her on a journey towards the restoration of all mankind.
Thea is bitter and alone, just like everyone else left eking out an existence on a sunless, cloud-covered Earth. A terrifying dream convinces her to save the life of sixteen-year old Viviana, who has a deadly infection, as well as a freakish patch of glowing skin over her heart. When this light spreads to Thea, causing her palms to glow, she is forced to trust Caden, an arrogant, lazy, and annoyingly handsome boy she utterly despises. Caden has a map to the last city on Earth, and the only place that might have a cure for both Viv's infection and the strange light on Thea's hands. As the trio embark on a journey through the barren wilderness, Thea and Caden discover, and try to fight, their mounting attraction to each other. Along the way they are joined by Rain, Naomi, and Enoch who explain that the light is not a curse, but a powerful gift meant to heal the polluted Earth and reconnect the remnants of humanity. When the group learns that Viv is the key to this planet-wide redemption, and that there are deadly shadows who will do anything to keep humans in the darkness forever, they each must make the difficult decision to help Viv fulfill her destiny...and save the world.