It is the Summer of 1940, and France has fallen to the invincible steamroller that is the might of Nazi Germany; Britain now stands alone, and the future looks bleak.

Pilot Officer Harry Rose, fresh from training and eager to prove himself, is posted to Excalibur Squadron, a Hawker Hurricane fighter unit based in southern England.

In the coming weeks and months of that fateful summer, as the outnumbered RAF battle grimly with the Luftwaffe in the skies above Britain, Rose will come to know what it is to love, and will experience both the glorious euphoria of success and the desperate bitterness of loss.

As his friends dwindle in number, Rose knows that it can be only a matter of time before it is his turn...