In September 1939, World War Two is declared. For RAF fighter pilots patrolling the Franco-German border it is a bizarre time: one moment they are chasing an elusive Luftwaffe, the next ordering champagne in Paris. Then, in May 1940, Hitler launches Blitzkrieg and the Hurricane squadrons find themselves engulfed in battle. follows the fortunes of two RAF pilots; Englishman Kit Curtis, and American Ossie Wolf, who clash not only with the Germans, but also with each other, fighting for different reasons and employing different methods as France collapses and the Allies face humiliation and defeat. They also encounter the insidious Fifth Column, the enemy within, and those intent on profiting from chaos...