10-year-old Lyosha is a fragile, dreamy boy who decides to commit a crime for the sake of his classmate Liza. After her mother got married and flew to another country, the girl suddenly stopped growing. Lyosha steals her mother's brooch in the shape of a dragonfly in order to sell it and buy Liza a ticket to her mother. Amazing adventures and difficult challenges await all participants in Operation Mukhadrakon.