August 1920 marks the final days of Emirate Bukhara. The city is surrounded by armed detachments of workers and peasants from Soviet Turkestan. Engraver Umar engraves on a blade gifted by the emir a coded instruction to the place where treasures are hidden. Ten years later, one of the emir’s former allies—Akhmatbek—along with his son Naruz Akhmed and an overseas intelligence agent, Kerling, try to find this blade to get the valuables. Georgy Mikhailovich Bryantsev (1904–1960) was a Cheka officer, an intelligence agent, a saboteur, and a writer who devoted his life to serving the organs of state security. His books are based on real events from his own biography.