Teenage boy Niam lives in one of the largest settlements of mammoth hunters during the last peak of the ice age. Together with the others, he hunts himself, learns natural skills, experiences "bushcraft" in the most difficult and purest form in the history of mankind. When the tribe flees from foreigners, he gets lost and wanders the country alone. With the arrival of winter, his slightly older sister finds him. Both the siblings will be captured by prehistoric hunters. The story of the children continues and one dramatic situation follows another. The facts are supported by the findings of contemporary anthropology, zoology, climatology, etc. The book with impressive illustrations by Kateřina Coufalová new findings are interpreted by the classic of this genre, Eduard Štorch. In addition to authentic-sounding descriptions and dramatic situations, the book is written by Pavel Radosta, who wrote two dozen professional and several hundred popularizing articles themes of history, nature, anthropology, art, returns the genre of adventure story in a real natural environment to Czech youth literature.