This is brilliant. The new play by Oliver Cotton, a 69-year-old actor, is set in New York in 1986. An ageing couple, Joe and Ellie, are practising their ballroom dancing when Joe’s maverick brother Billy comes crashing through the front door. The cops are after him. He was holed up in a Florida hotel when he spotted the Nazi brute who tortured them all at a death-camp during the war.