Anatoly Rybakov's novella tells the story of the adventures of Seryozha Krasheninnikov, a Moscow schoolboy nicknamed Krosh. The main character encounters difficult situations where he has to make moral choices, uphold justice, and learn to take responsibility. This book about growing up, friendship, and honesty became a classic of Soviet adolescent literature. The work captivates the reader with its dynamic plot and vivid characters, while simultaneously addressing important moral issues. Krosh's story is not only entertaining but also teaches the reader values that remain relevant for every new generation.