This film is made in the genre of docufiction for a young audience. The film tells the story of the great russian traveler of the early 20th century Piotr Kozlov, an explorer of Central Asia who discovered the anciente city of Khara-Khoto lost in the sands. Unfortunately, this name is little known, although the Hermitage and other museums are proud of the collections from his expeditions. The plot of the film is the "path" of a young scientist who inmerses himself in the "unknown personality" of the passionate Kozlov, in the "era of great discoveries" that took place 100 years ago. The viewer follows the hero of the film. A parallel is the Mongolian Scientific Expedition of 2023-2024 "Along the routes of Piotr Kuzmich Kozlov". The expedition includes famous scientists, historians, archaeologists and geologists.