It is July 1941, and the Nazis are advancing towards Kiev at great speed. As the situation in the city becomes more tense and untenable, Ivan Rokotov's job, as senior investigator at the Kiev Military Prosecutor's Office, becomes increasingly busier. When Nikolay Mirsky, Deputy Chief Military Prosecutor of the Red Workers' and Peasants' Army, unexpectedly arrives from Moscow, he quickly decides to form a special squad at the Military Prosecutor's Office of the Front to include Rokotov and Svetlana Yelagina, a former investigator for the Dnepropetrovsk Crime Investigation Department. Rokotov and Yelagina are tasked with investigating major cases by acting both at the frontline in the territory of the Kiev Fortified Area, 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 and suffering.