After the Nazis started the bombing blitz of England, Beryl Clarke puts her college on hold to return to Leeds, care for her mother, and work as a secretary at the Waddington game company. While she endures the war at home, her brother James fights the enemy in the air. When he is shot down, injured, and captured, James reunites with a former college friend American POW Kenneth Bordelon, and they plan to escape the Nazi prison camp. Beryl knows there is a board game with escape plans being delivered to POWs by the Red Cross. But how can she let them know about the game's secret without revealing the information to the enemy?