The first Ukrainian adventure detective story. The action takes place in Odesa in 1920, occupied by Denikin's troops. The White Guard counterintelligence conducts a fruitless search for the Bolshevik agent "7+2". The search is led by officer Enger. Dizzying races, disasters, and murders further confuse the agent's trail. It is only with the arrival of the Bolsheviks that the case is solved. Incompletely preserved