When the first manned mission to Mars makes an unexpected return in 2037 with a dead crew, a terrible contaminant is unleashed that turns the skies purple and threatens humanity’s survival. It brings with it a frightening new apex predator that bumps the surviving humans down the food chain. In this new world, the unflappable sixteen-year-old, Zach Granger, rides his dirt bike across the scorching Arizona desert. With only a shotgun and his loyal beagle hound, Zach must find the robotics expert, Skylar Lucas—a man who may not even exist. His life hangs in the balance when the monsters catch his scent, and Zach must race to California in a quest to find where he belongs.