In August of 1939, as Britain watches the headlines in fear of another devastating war with Germany, three childhood friends must choose between friendship or country. Erstwhile socialite Nora is determined to find her place in the Home Office's Air Raid Precautions Department, matchmaker Hazel tries to mask two closely guarded secrets with irrepressible optimism, and German expat Marie worries that she and her family might face imprisonment in an internment camp if war is declared. When Germany invades Poland and tensions on the home front rise, Marie is labeled an enemy alien, and the three friends find themselves fighting together to keep her free at any cost.