After succumbing to a drug addiction that cost him his job, money, and dignity, Miles Barrett is entering his new home: a prison. Determined to get his life back on track, Miles plans to serve his time and make things right with his wife and daughter. While asleep on his bunk during his first night, Miles is ripped awake by a terrifying crash. A moment later, in the dark, guards rush past his cell. He hears gunfire, shouting, and then the horrible, sickening screams of a man being torn apart. Something is loose in the prison - and it's coming for Miles...