To raise money for minor repairs, the school management came up with a wonderful competition game: collecting waste paper. And before 6 “A” had time to win this competition, everything collapsed. Some scoundrel from their class put metal plates in the paper. The deception was discovered. Instead of first place, 6 “A” was waiting for shame... And also - a real detective investigation! After all, it is imperative to find out who carried out the forgery and damaged the honor of the class. However, instead, Oleg and Dimka went on the trail... of the real criminals. Because the metal that ends up in waste paper has extraordinary value! And now the detective boys, having created a tunnel, are making their way into the territory of a suspicious company. But suddenly shooting starts. Who are they shooting at? Why?..