To commemorate the 80th anniversary of the start of World War II, four celebrated actors explore their grandparents\' extraordinary wartime stories. Helena Bonham Carter, Carey Mulligan, Kristen Scott Thomas and Mark Rylance star. Helena Bonham Carter relates how her grandfather defied orders by helping Jewish people escape the Holocaust, while her grandmother volunteered as an air raid warden and campaigned for women\'s rights. Actor and peace campaigner Mark Rylance explores the extraordinary World War II story of his grandfather Osmond Skinner, who spent almost four years as a Japanese prisoner of war. Kristin Scott Thomas uncovers the story of how her grandfather William saved thousands of lives at Dunkirk while serving as a commanding officer in the Royal Navy throughout WWII. Carey Mulligan explores how her grandfather travelled thousands of miles to fight the Japanese in the final months of WWII, and lost his closest friends from a kamikaze attack at sea.