Mark Sinclair, a young pilot who is thrust into the air war over southern England, facing ruthless and unyielding opposition while flying his Spitfire against the enemy in a ratio of 4 to 1 outnumbering the RAF. This battle became known as the Battle of Britain. With increasing pressure, he loses friends and experiences the loss of his ideals of being a knight of the air. The airborne man seems unstoppable, while on the ground he is enveloped by nightmares. Two wars are being fought by Mark Sinclair, one against the Germans and the other against himself. The one woman who cares for him is struggling to keep him sane.