September, 1938. Britain is at war and Ruth Aspinall, a gifted pilot, is determined to join the Air Transport Auxiliary, an organisation of civilian pilots who ferry aircraft to wherever they're needed. Meanwhile over in America, siblings Jack and Lucy Nelson, both experienced pilots themselves, are keen to join too. After a perilous journey by sea, Jack is soon having his first experience of the London Blitz before being posted to White Waltham, where he quite literally bumps into Ruth and romance soon blossoms. On D-Day, Jack is sent to France to deliver a Spitfire, but he is declared missing in action after his plane fails to arrive. Heartbroken, Ruth must accept that the love of her life may never return . . .