A dad and his son, a country aside. Desperate times make for desperate people.

Buck and Garth try to retain their mankind as they battle for his or her lives. How many others can they help? As long as they even try? No-one knows what’s happening except a handful of people as well as they aren’t sure what occurred, but most of all, just how do they stop it?

The survivors are rushing to Colorado in an epic race. Period is operating against them in more ways than one.