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May 1926, Paris. In the Bois de Boulogne, young lovers find a man with signs of torture and no ID. He died before the police arrived, having uttered one word: "Makhno". The only thing that Inspector Pierre Montagne knows about the former leader of the anarchist army is that he has been in contact with Ukrainian political exiles. So Klym Koshovyi, who serves as Simon Petliura's bodyguard, is involved in the case. Meanwhile, the Chief Ataman is beginning to prepare an uprising against the Bolsheviks, so he does not need the police's attention. To avert it, it is necessary to identify the unknown and find the killer. This is how Klym Koshovyi's most dangerous adventure begins."

"The Unknown from the Bois de Boulogne" is the tenth book and the epic finale of the beloved retro series.