Detective mysteries await the detective brothers Dima and Alyoshka even where they are not and cannot be. The guys were spending their holidays in a quiet village, in which absolutely nothing happened, when suddenly - the theft of the century! A priceless icon has been stolen from a local church! How can the sons of Colonel Interpol lie on the grass and take care of the watermelons that their mother decided to grow if the national treasure is about to float away from Russia? The priest Father Leonid told an old legend: in ancient times, when enemies attacked Rus', people took refuge in the church, and then made their way underground into the dense forests. “Or maybe the underground passage still exists?” - the young detectives ask themselves, and one day exactly at midnight...