In northeastern Pennsylvania sits one of the state's newest prisons, SCI West Branch. Located in the West Branch Valley between Muncy and Hull's Landing, it houses the worst of the worst. Murderers, kidnappers, arsonists-you name it, and they've done it. When a mysterious virus that plagues the country makes its way into the prison, hell is unleashed in the form of the living dead. Guards and prisoners are transformed into flesh-eating creatures that will stop at nothing to satiate their appetite. Not everyone in the prison is affected though, and it's up to those few to find a way out, battling through not only the undead, but the criminals who have now taken control of SCI West Branch.