Colonel Bestuzhev has an assignment to support the Soviet offensive by forming an air regiment equipped with the newest Yak-3 fighter aircrafts. He gathers his old companions-in-arms, top graduates of air force academies, to form one powerful regiment of fighter pilots, warring side by side with their bold and beautiful female colleagues. They have a challenging task ahead of them - to uncover intricate German defense plans under the enigmatic code name “Pandora’s box”. Amidst fierce air combat, a squadron of French pilots joins the Soviets. But a brave pilot can withstand the hardships of war and even find true love...