When the entire world grinds to a halt from the zombie apocalypse, the small California desert town of Single Tree finds itself under siege by hundreds of stranded motorists, including a busload of convicts being transferred from one penitentiary to another. As the townspeople begin to enact billionaire Barry Corbett's plan to turn the town into a virtual fortress, they find they have to defend their lives and property from the living, as well as the dead.
In Los Angeles, LAPD Detective Reese, Patrol Sergeant Bates, and rest of the Hollywood Station cops are locked in a life-or-death struggle against the hordes of flesh-eating dead that threaten to drown the City of Angels beneath a tsunami of rot and despair.