The unexpected meeting of Selin and Ukhov (main detectives in these series) with felon Petya ends with the pursuit and the corpse of the latter. With him they found a bag of money. While the guys are figuring out who needed such a huge amount and why, the brother of the late Pasha Apostolov broke a deal in a large consignment of diamonds. His accomplice Prikhodko plans to return the money at all costs. He takes Nastya hostage and demand an exchange. The special department is alerted in full force .