Set in Britain, Poland, France, and Germany — on the World War II frontlines and the home front — World on Fire from Masterpiece traces the fates of several families in 1939 and 1940, from the Nazi invasion of Poland, to the near debacle at Dunkirk, to the fall of Paris and beyond. The international cast includes Helen Hunt, Sean Bean, Lesley Manville and Jonah Hauer-King.