Man in the Passage Yard

Storyline: Grigory Mikhailovich Yushkov, who was killed in the passage yard, was considered dead during the Great Patriotic War. In those same years, under strange circumstances, the partisan detachment and the entire city underground were destroyed. They were betrayed by a man nicknamed "Centaur", who was never found. What are the motives for the murder of Yushkov and is he a “Centaur”? An investigator from Moscow will have to find out...