In the time it takes to create a single beat of a heart, 75 percent of the population drops dead. Within hours, another 20 percent succumb leaving only a speck of human life remaining. Believing they are victims of a preliminary act of war and eventual invasion, a group of survivors trek across a barren United States following a radio signal. The simple plan was to band with others to fight and defend their homeland. However, their journey not only brings them together with other survivors but also brings them a chilling truth. What had happened to their country was not a prelude to invasion, but rather the groundwork of global extermination. The enemy is not what they expect.