1935 A young woman was killed in Gorky Park on the day of the visit of an important foreign guest. Those at the top believe that this could be a provocation undertaken to discredit the Soviet Union in the eyes of foreigners. The investigation was entrusted to one of the best detectives of the Moscow Criminal Investigation Department, Ivan Opalin. The case seems relatively simple to him, and he does not even give up other investigations for the sake of it. But it soon turns out that the victim, whose identity he established, has been dead for several years, according to documents...