A dark, gritty British thriller based on the best-selling novel by Ronnie Thompson, set in the dangerous underworld of one of the UKs toughest prisons. Fresh from a traumatic tour of Iraq, Sam Norwood (James DArcy) finds himself forced to take a job as a Prison Officer in one of her Majestys most brutal institutions. On the inside he learns the ropes from his colleagues, a bunch of hardened screws, but his life begins to spiral out of control as he drinks & takes drugs to help him deal with the stresses & strains of the job & his past. As he nears rock-bottom, he is unprepared to learn the hardest lesson of all: that the screws are often as corrupt as the criminals they keep.