Mary is a driver for the ATA and although she yearns to fly a Spitfire she fears her humble background will hold her back. After all glamorous Angela is set to be the next 'Atta Girl' on recruitment posters. Bobbie learned to fly in her father's private plane and Jean was taught the Queen's English at grammar school before joining the squad. Dedicated and resilient the three girls rule the skies: weathering storms and dodging enemy fire. Mary can only dream of joining them - until she gets the push she needs to overcome her self-doubt. Thrown together the girls form a tight bond as they face the perils of their job. But they soon find that affairs of the heart can be just as dangerous as attacks from the skies.