Find the Weatherman. This vague directive is all that Askari and the others have as they head north into an increasingly cold and snowy winter. With Minda leading the ragtag band of Baratok members, they head to the Marketplace, a center of trade for the many communities and tribes that survive within the region. But no one has seen the Weatherman in weeks.

Their only clue is from a crotchety old man named Moose, who agrees to lead them to the most recent location where he saw the Weatherman in exchange for a fee. They set out despite the looming snowstorm, knowing that if they fail, it's not only their own lives at stake, but the lives of everyone everywhere.

They have to stop the flood of monsters into the world, or there won't be anyone left to save.