The Whispers of War by Julia Kelly

Marie, Hazel, and Nora have been best friends since boarding school. But with war looming, London in 1939 is not a safe place for German-born Marie. With Hitler advancing in Europe, there have been rumors that the British government will start categorizing Germans and Austrians who live in Britain, and some could be placed in camps if the authorities believe they are a threat to national security. The Whispers of War recounts the women's friendship during 1939 and 1940 and tells a contemporary story of Marie's granddaughter, Samantha, who travels to England to meet Nora and learn more about her grandmother, who passed away a year ago.