House on Baumanovskaya. Lee Yu.

Moscow, September 1928. In strange circumstances, an agent of the threat was shot dead. Senior investigator Frolov suspects the murder and goes for a verdict to the forensic expert Professor Greni. He confirms the fact of suicide, but advises to start an inquiry. The deceased agent protocolized the mass riots with the participation of former prisoners of war - it turned out that foreigners are inciting counter -revolutionary scandals and arrange brawls against the Soviet regime. Not only officials, but also ordinary schoolchildren are drawn into this. The daughter of Professor Mike will have to save his comrades from the court, and Grenih himself - to grab with his own Moriarty and try to expose the underground network, which is not at all in the housing issue in Soviet laws...