1939 - Officer Felicity Newman and a ragtag group of young women arrive at RAF Colston. They are the first of the Women's Auxiliary Air Force: brave female pilots ready to do their bit.
But Station Commander, David Palmer, doesn't want them. They're a nuisance, unable to do the work of men, and they would undoubtedly fall apart if the station was bombed.
Felicity is determined to prove the worth of her 'Bluebirds'. There's Anne, who loves to dance but finds herself peeling vegetables in the station kitchens. Winnie, longs to work on the aeroplanes themselves but meets rejection at every turn. And Virginia, who is desperate to build a new life for herself.
As the war goes on, so the girls make their mark - behaving heroically under fire, supporting the pilots with their strength, loyalty, and often their love - a love sometimes tragic, sometimes passionate, but always courageous.