An orphan who spent her youth without a true home, Marion Hoxton found in the Great War a chance to belong. As a member of the Women's Royal Naval Service - the Wrens - Marion Hoxton gained sisters. She found purpose in her work as a motorcycle dispatch rider, assigned to train and deliver carrier pigeons to the front line. Now, 20 years later, another war has broken out across Europe, calling Marion to return to the fight. Meanwhile, others, like 20-year-old society girl Evelyn Fairchild, hear the call for the first time. With the re-formation of the Wrens as World War II rages, it's the perfect opportunity to make a difference in the world.