A tragicomedy about a talented, but not very successful musician, Kolya, who plays the French horn and desperately tries to find a place in a well-known orchestra. He defends his right for victory with a complicated deal with his own conscience…

The film is about a generation of brave and beautiful people who did not see the destruction of the revolution and the chaos of the civil war, who dreamed of building a new life in which there would be no place for death, but only incredible love that opens the way for them to great achievements and discoveries. About exploits and glory, betrayal and loyalty of those who were heroes in heaven and on earth. About the time of immense trials that fell on their short but bright lives. About a woman who was the dream and true love of the Soviet Union.

Russia, the late 19th century. As the threat of war with Great Britain looms, a mysterious device—a mechanical flea—is discovered within the Imperial Palace. Tasked with investigating the incident is a young officer, Pyotr Ogaryov, who dreams of earning the trust of Tsar Alexander III. In his quest for the truth, he joins forces with Lefty, a brilliant but forgotten master craftsman from Tula. Together, they plunge into a world of intrigue and danger. To uncover a conspiracy, the two heroes must challenge the established order, unravel family secrets, and make a difficult choice between duty and passion. The security of the nation—and their own destinies—hang in the balance.