If you think sensibly, then Filya Lopushkov should not have been at all worried about the strange things that were happening. It would have been possible to ignore them if not for yesterday's event. He was unfairly accused of being a hooligan in the entrance! Deciding to find the troublemaker, Filya begins her investigation. But he has to face a series of serious mysteries. Who and why stole the letter sent from America to Owl's neighbor? Why is the entrance attendant behaving so strangely? What is the connection between this old woman and the guy who comes to her? Filya and his friends are determined to answer these questions, even if to do this they have to unravel the mystery of the Egyptian papyrus...