A US soldier suffers a traumatic brain injury while fighting in Afghanistan and struggles to adjust to life back home in New Orleans. When she meets local mechanic James, the pair begin to forge an unexpected bond.

After a Russian bioweapon turns humans into half-dead killing machines, a group of highly trained Special Operators must defend a remote outpost in Far West Texas. While fighting off the infected, the group must also defend against a band of anarchist rebels who threaten to destroy the last remaining signs of civilization. In a race to preserve humanity only the strongest can survive.