Anton Zvontsov is a young, sociable, ambitious opera with his problems and his own code of honor. It conducts formal investigations and concurrently resolves cases of clients who do not wish to apply to law enforcement agencies. No one better be able to speak to an intimidated witness, find compromise on a well-known businessman or important evidence, negotiate with armed bank assailants, or catch robbers on the cutting edge. However, when a maniac and Zvontsov's personal enemy emerges in the city, he will not know for the first time how to catch a scoundrel and save his relatives - his sister, his beloved and his friends.