A special unit has been formed at Petrovka, 38 to investigate the most serious crimes that have significant social importance and reflect the present time. The department consists of former employees of the Ministry of Internal Affairs, prosecutors, and the best detectives from the Criminal Investigation Department. One of the investigators, Stanislav Dolya, the head of the unit, died in a car accident. His colleague and loyal comrade, Andrey Semyonov, believes that the accident was not a simple coincidence.