A father and his son, a country apart. Desperate times make for desperate people.

Buck and Garth try to retain their humanity as they fight for their lives. How many others can they help? Should they even try? No one knows what's going on except a handful of people and even they aren't sure what happened, but most importantly, how do they stop it?

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