Enraged, a teacher murders a young female pupil. Over the years, another boy is bred for one sole purpose: to avenge his sister’s death.

Girl Aya arrives at the sanatorium, and slowly sinking into the interweaving of complex human relationships, taking a pain and suffering of patients and separated people.

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.