How often do police officers ask children for help? No! But Lieutenant Yakushev asks for help from young detectives Dasha and Petya, whom he met during the previous investigation. A girl is missing. It is assumed she was kidnapped, but officially no one reported it to the police… So who should conduct the investigation? Those who don’t sit with folded arms! Those who act without sparing either effort or time! Dasha, Petya, and their friends…