When the sound of an incoming helicopter interrupts Ash and Caleb Solomon's fishing, it reminds them that their mountaintop community of Beartooth may be isolated, but it's no secret from the outside world.

Ash, Caleb, and the residents of Beartooth struggle to develop stronger defenses, a new source of electricity, and increase food production to survive the longer, colder winters resulting from the government's geoengineering program. As the residents of Beartooth search for solutions to a growing number of threats, the rest of the world slips further into anarchy.

With few ways to protect themselves against intruders, the residents retreat from conflict, but will it be enough to save them from their first encounter with their ruthless neighbors?