Inspired by true events in South Africa, 1987. When Leon, a white 19-year-old prison guard commits an inexplicable act of violence, killing seven black men in a hail of bullets, the outcome of the trial - and the court’s sentence - seems a foregone conclusion. His hotshot lawyer John Weber (Coogan), a passionate opponent of the death penalty, reluctantly takes on the seemingly unwinnable case. John discovers that young Leon worked on death row in the nation’s most notorious prison, under traumatic conditions: befriending the inmates over the years while having to assist their eventual execution. As the court hearings progress, the case offers John the opportunity to put the entire system of legally sanctioned murder on trial. How can one man take such a dual role of friend and executioner, becoming both shepherd and butcher?