July 1941. The Nazis rush to Kiev. Circumstances in the city are getting worse every day, which adds work to the best investigator of the Kyiv military prosecutor's office Ivan Rokotov. Mykola Myrskyi, Deputy Chief Military Prosecutor of the Russian Armed Forces, arrives from Moscow. He is creating a special department in the military prosecutor's office of the front, which includes Rokotov and former investigator of the Dnipropetrovsk UHRO Svitlana Yelagina. Rokotov and Yelagina begin to investigate particularly important cases, acting both on the front lines, in the Kyiv fortified area, and in the city itself, where the intensified criminal world is beginning to unite with German saboteurs. At the same time, Mirsky is conducting his own investigation, the task of which is to identify a spy organization that has been operating in Kyiv since the late 1930s.