Police captain Aleshin is investigating a case related to the theft of opium at a chemical factory warehouse. Everything suggests that the offender must be sought among the employees of the enterprise. One of the workers, Frolov, is familiar to Alyoshin in another matter. And although Aleshin is confident in Frolov’s honesty, he suspects something was wrong, seeing how he hides something from him and himself suffers from it. At the dacha, the factory director Vasiltsev killed his stepfather, who turned out to be an unnecessary witness. A trace brings Aleshin to a plant employee, a certain Olga ...

How can anyone take a person seriously when his last name is Zaychik (Little Hare). Everyone can manipulate and make fun of him. And Zaychik never strikes back just because he is too shy. But to the surprise of everyone love makes a lion out of little hare.

After upsetting the criminal underground in 'the Master Blackmailer' case, Sherlock Holmes has to face his archenemy: Prof. Moriarty.