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. They have a challenging task ahead of them - to uncover intricate German defense plans, code name Pandora's box.

The hospital staff are unsure of how to treat Zhenya since all her documents were destroyed during the raid; at a training aerodrome located near the aircraft factory, Bestuzhev observes the training of flight cadets and meets an old friend.

Colonel Bestuzhev has an assignment to support the Soviet offensive by forming an air regiment equipped with the newest Yak-3 fighter aircrafts.

Another attempt to destroy the German fortifications ends in almost complete defeat after Vadivasov fails to complete Bestuzhev's task of pinpointing the German air defences on the map.

Colonel Bestuzhev has an assignment to support the Soviet offensive by forming an air regiment equipped with the newest Yak-3 fighter aircrafts.

An aviation crew work together to solve Germany's defensive plan.