Based on the true story of the 1983 mass breakout of 38 IRA prisoners from HMP Maze high-security prison in Northern Ireland. As Larry Marley (Tom Vaughan-Lawlor, Avengers: Infinity War), the chief architect of the escape, schemes his way towards pulling off this feat, he manipulates prison warder Gordon Close (Barry Ward, Jimmy's Hall) in order to get closer to his goal.