Arriving to visit his grandmother in the village, Dimka Molodtsov first finds out that a bloodthirsty maniac is wandering around the area. Together with his friend Fedka, he decided to catch the killer. But young detectives have too many questions... Who stole an ancient painting from the museum and why? Why is a person with a strange surname Vampire not reflected in the mirror? Why was a glass coffin brought to the village from America? The investigation reaches a dead end. But Dimka and Fedya are sure that the answers to these questions will lead them straight to a maniac. And the police will only have to catch the murderer...