After the long Great War leaves behind a shattered Europe without an entire generation of men, Great Britain permits women to serve their country as soldiers, sailors, and especially pilots. It's the spring of 1940 and Briley Bannatyne envies her older brother Mackinley. He's about to embark on a grand adventure, training to become a pilot officer in Britain's Royal Air Militia. When tragedy strikes, a badly hurt Mackinley convinces Briley to take his place in the Air Militia. Service is harsh - nothing like the radio shows where brave Air Militia pilots hunt pirates over the skies of Britain. Kendrick is one of these marauders, captured after Briley shoots him out of the sky. Brash, charismatic and mysterious, Kendrick becomes her unexpected friend and ally.

On a continent already battered by war, a terrifying new enemy emerges that conquers much of Europe before turning its sights on Britain. All that stands between the unstoppable Black Legion and invasion is Briley and a handful of brave pilots. Can Briley and her friends turn back the Legion, and will Briley's friendship with the pirate become the key to saving Britain...