It is July 1941, and the Nazis are advancing towards Kyiv. A special squad is tasked with investigating major cases by acting both at the frontline and in the city itself, where rising criminals are joining German subversives in infiltrating the city, while a number of Soviet government representatives are happily profiting from other people’s misery.

A year and a half after her husband's assassination by a criminal gang, a death threat looms over Tamara. Her best friend Boris is also a police officer. Driven by a desire to solve the murder and his secret love for Tamara, he starts an investigation.

Summer and autumn 1944. Odessa. The city, liberated by the Red Army from the German-Romanian occupation, begins a new lease of life. But, according to military intelligence, a network of Abwehr agents recruited from among the local population and professionally trained saboteurs remained in the city after the Nazis retreated. Now a special task force is being formed in Moscow consisting of members of SMERSH and the military prosecutor's office investigators, who will be sent to Odessa to strengthen the local authorities and the police. The group, under the command of SMERSH Captain Viktor Zvyaginov, includes two investigators from the military prosecutor's office, Svetlana Elagina and Ivan Rokotov, who not only find the trail of Abwehr agents, but simultaneously solve a number of criminal cases. Along with their professional military activities, the romance between Svetlana and Ivan, who lost each other during the Red Army's retreat from Kharkov in 1941, is rekindled when they are reunited after a long separation.

May 9, 1945. On the square of the small town of Insterburg in East Prussia, this day is met by Rokotov, Elagina and Fedorenko. They rejoice together with all the soldiers of the Red Army. The war is over. The townspeople huddle up to the houses - some of them are crying, and some are sighing with relief. An impromptu dance floor immediately appears on the square, a young lieutenant plays the piano right in the center of the square. Everything turns upside down in an instant, when a machine gun starts shooting from the roof of one of the houses on the square - And then - Then the everyday life of the military prosecutor's office in the occupied territory begins - murders, robberies, thefts. And of course, the German agents, which changed their owners, but did not change the enemy. And sometimes it seems that the war is not over yet. That for the final victory it is necessary to take one more step, and then another, and another.

Autumn 1941. Miraculously escaping from the Kiev boiler, investigators from the military prosecutor's office Rokotov, Mirsky and Elagina arrive in Kharkov, where evacuation is already in full swing. They have in their hands important information about the activities of the German espionage organization. New circumstances force them to linger in Kharkov. Indeed, together with the enterprises being evacuated, under the guise of refugees, further groups of German saboteurs are moving further east, whose purpose is sabotage and sabotage at military factories. Trying to open the channels for transporting scouts to the Soviet rear, Rokotov and Elagina find out that the organization operating in Kharkov is directly related to the Kiev group that they discovered a few hours before the city was surrendered. And the curator of both of these groups occupies a high post in the Main Military Prosecutor's Office.