Bobby and Becca Warren are enjoying college life when a mysterious disease ravages the country. With chaos ensuing, they head home but discover its been burned and find the graves of their mother and youngest brother in the backyard. With scavengers swarming over the neighborhood, the siblings search for their father using clues he left behind, but before they can find him they are captured by a local militia. Caught between a psychotic killer and an advancing foreign army with no chance to escape, they can hope only one thing. That their father will find them. If he even knows they're alive.