New Year's Eve, 1940: Evie Chase, the beautiful debutante daughter of a rich and adoring RAF commander, listens wistfully to the swing music drifting out from the ballroom, unable to join in the fun. With bombs falling nightly in London, she is determined that the coming year will bring a lot more than dances, picnics and tennis matches. She is determined to make a difference to the war effort. 2nd January, 1941: Evie curses her fashionable heels as they skid on the frozen ground of her local airfield. She is here to join the ATA, the civilian pilots who ferry Tiger Moths and Spitfires to bases across war-torn Britain. Two other women wait nervously to join up: Stella Grainger, a forlorn young mother who has returned from Singapore without her baby boy and Megan Jones, an idealistic teenager who has never left her Welsh village.