1946, Manhattan. Grace Healy survived World War II after losing a loved one. She hoped that the shadow of the past would never disturb her again. However, everything changes when, on the way to work, the girl finds a suitcase hidden under a bench. Unable to resist her curiosity, she discovers a dozen photographs of young girls. Who are they and why did they end up together? Grace soon meets the owner of the suitcase and learns about twelve women who were sent to occupied Europe as couriers and radio operators to help the Resistance. None of them ever returned home. Wanting to find out the truth about the women in the photographs, Grace plunges into the mysterious world of intelligence to shed light on the tragic fates of brave women and their amazing stories of love, friendship and betrayal during the war.