Sergey Yarokhin is a senior investigator of the homicide department. Principled and unyielding. Living for a good cause and always ready to take risks. He is hated by both criminals and dishonest colleagues. Sergei Yarokhin always brought the most difficult and dangerous cases to an end and was never afraid of threats. During one of the operations with the participation of OMON, which Yarokhin personally supervises, they "take" the leader of a gang of drug dealers, who is trying to hide behind his assistants. As a result, everyone ends up in prison: small distributors, and the leader of the criminal group himself, the inveterate bandit Anatoly Bykov, or Bull.