Avdeev begins to dig into Medushevsky and finds out that there is compromising evidence against the lawyer in the St. Petersburg archive: a few years ago, a murder case against an assistant prosecutor thundered across the country. Then Medushevsky took over the business of former crime bosses. Avdeev meets Andrey Vershinin, his friend from the orphanage, in the archive and steals a secret case. The policeman does not have time to study it: on the way to the port, he gets into a fatal accident. Andrey Vershinin from the archive is unexpectedly appointed chief of police in Portovo.

Mayor Bachurin unceremoniously interferes with Vershinin's work. So, he does not allow the chief of police to summon the children's ombudsman to collect information on the case of children from an orphanage who are taken to the dolphinarium under strange circumstances. Meanwhile, there is another robbery of a collection car in the city. Nikitin asks Medushevsky to sort everything out. The lawyer is sure that he cannot do without Vershinin's help here, and suggests that the policeman meet and talk.