The protagonist, a young anthropologist named Vladimir Porazhayev, firmly believes in the existence of the legendary Tapi tribe, despite skepticism from his friend and expedition leader, Krohalyov.
Tied to a post alongside a rebellious tribesman named Chudak, who is condemned for his unorthodox behavior, Porazhayev witnesses a tribal council led by a chief resembling Krohalyov.
In Moscow, Chudak—a comically naive yet curious figure—finds himself in a series of misadventures, from being mistaken for an athlete and winning a race to causing chaos in the city with his attempts to integrate into modern society.
A pivotal moment occurs at a scientific conference, where Porazhayev proves the Tapi tribe’s existence while Chudak nearly eats Krohalyov in frustration over his dismissive attitude.
He is awakened by his fellow expedition members but remains steadfast in his determination to find the elusive Tapi tribe, leaving the audience with a blend of humor, adventure, and an enduring sense of wonder.