Not far from his home, a close friend and deputy head of the investigative group, Colonel Khabarov, is killed. A hired assassin is responsible for his death. After this incident, the colonel postpones his plan to retire. He intends to investigate his friend's murder and will stop at nothing until the killer and the client are found. He is assisted in the investigation by his new subordinate, Major Ershov. The colonel is not pleased with him, but the young man was imposed on him by the management...