Before the young detective Romka had time to realize that instead of a runaway hedgehog, he had found a real treasure, the treasures had to be given to someone unknown. What to do: a strange unknown voice reported on the phone that Venechka, Romka’s best friend, had been kidnapped, and demanded that for his release he leave the found bag with prehistoric shells in a designated place. That’s what the guys did, and what was their amazement when it turned out that their friend... no one even thought of kidnapping them! Who tricked friends like first-graders? How did he know about the priceless find? And how can I get her back by exposing the criminal? “It seems it’s time to start a new investigation,” Romka says to himself and first outlines the circle of suspects...