Will Bradley is one of Garner Maximum Security Penitentiary's finest officers. On his way to work, Will is in possession of a magmatic stone of an extraterrestrial origin that unbeknownst to him carries within it an alien entity that has lain waste to the civilizations of countless other worlds. One bite from the other worldly creature will turn mankind into mindless eating machines that will stop at nothing to seize what their palates crave most - human blood. After his exposure to the unearthly parasite, Will ushers the pestilence into the prison that employees him and introduces it to the entire population.
Wrongfully convicted former Marine, David "Roamin" Roth sits somberly in prison. His day to day life takes a turn for the worse when he steps on the toes of the leader of a Nazi hate group. After being placed in protective custody for safety, Roamin begins to notice that things are not as they should be.
After nearly a week in lock down, Roamin hasn't seen anyone in days. The smell of death and rot flood the cell block in which he is being housed; shrill cries fill the air moments before the only officer he's seen in days tumbles down a flight of stairs.
What few survivors remain must band together to face the hunger of an extraterrestrial evil that kills at will; that is, if they don't kill each other first.