In the cold, blank grey of a high-security cell, Jurek Walter (Stephen Graham) sits preternaturally still, legs crossed, hands in his lap, whispering into the sink beside him. His voice emerges from the pipes into another cell, entreating its resident to suicide: “There’s only one way to stop the pain,” he coaxes. Eventually his victim runs, full tilt, into the opposite wall, caving in his own head. It’s an opening that seems almost to shout: “You’re going to want to watch this!”