The summer of 1971 was hot and dry. This circumstance ensured that the plan would be exceeded and promised large earnings for Ivan Kopyriv's geological exploration expedition, which was located in the area of the Tunguska village of Erbogachen. Upon encountering a layer of permafrost, master Yelfimov, contrary to fire safety regulations, ordered the permafrost to be thawed with bonfires. However, the dry and gusty wind did its job: the resulting fire spread with catastrophic speed to the continuous forest areas, and the situation spiraled out of control.

The action takes place in the late 1940s. A large-scale land-surveying research is underway in a remote area of Eastern Siberia. The work had almost been concluded when a wire arrives with the news of people disappearing in the locality of Yambuy. The expedition’s chief and radioman decide to go in search of the lost ones. The local Evenk hunters come to their aid. Many dangerous adventures lie in store for these daring people before they find the culprit – a man-eating bear.

1947 ... The Savchenko family returns to Moscow from evacuation - husband and wife with Kostya's little son. They settle with Grandma Kostya in a huge communal apartment. Street meets the boy with a flock of local boys. Then there were: the division of the territory with the "Sretensky"; trophy movie “Girl of my dreams”; a school with separate education, camp discipline and essays about the border guard Karatsyup. And the monetary reform of 1947, when all of their savings depreciated in an instant, and the boys let out boats from banknotes in puddles.

The film is dedicated to Dmitry Ilyich Ulyanov, the younger brother of V.I. Lenin, a professional revolutionary, doctor and creator of the first Soviet sanatoriums and rest homes in the Crimea.

On the life and activities of N.I. Podvoysky (1880-1948), a professional revolutionary and commander of the Red Army.

Carl Hamilton is called to Moscow to testify on behalf of a GRU officer who is charged with treason against the state. He has to testify that the officer has not sold information to Sweden.