Romka did not long enjoy the laurels of a great detective, which he rightfully received after a successful investigation. A mischievous boy named Denis declared war on him, so now both were actively fighting: they fought, called names, shot peas at each other. And suddenly Denis disappeared... To divert suspicion from himself, Romka puts together an investigative team from his friends and begins the search for his former enemy. It soon became clear that Denis had been kidnapped: his father received a threatening letter. The bandits demand that he withdraw his statement from the police. And for failure to fulfill this condition, the son may pay with his life...