Sergey Voronin is a criminal investigator. He forms a club for officers, where they can engage in sports and meet interesting people. He is worried about a group of boys, who have fallen under the influence of a cynical school student, Nikolay Botko, who confuses robbery with a simple prank. Nikolay’s mother, a famous reporter, is too busy doing her job to influence her son, and school teachers have no complaints about the boy’s progress in studies. Impunity pushes him to the crime. He stabbed with a knife a girl who refused to join his clique…