Two months before the outbreak of the Second World War, seventeen-year-old Geoffrey Wellum becomes a fighter pilot with the RAF . . .

Desperate to get in the air, he makes it through basic training to become the youngest Spitfire pilot in the prestigious 92 Squadron. Thrust into combat almost immediately, Wellum finds himself flying several sorties a day, caught up in terrifying dogfights with German Me 109s.

Over the coming months he and his fellow pilots play a crucial role in the Battle of Britain. But of the friends that take to the air alongside Wellum many never return.