The Sinner

Tom Killgannon, a former undercover cop now in witness protection, is called back into action to gather crucial information from within Blackmoor Prison, where notorious child killer Noel Cunningham is incarcerated. Operating undercover and alone, Tom faces imminent danger from the prison's hardened criminal inmates, including a former gang leader seeking revenge. As he navigates the perilous environment, questions arise about why DS Sheridan is unreachable and the true purpose behind his assignment.