Neighbor. Residents of a communal apartment contacted the "Forbidden Zone" agency, searching for a man named Nikolai Sergeyevich Pechatnikov. They don't suspect or accuse him of anything. He's registered but doesn't live in their apartment, and they just happened to have a very good exchange opportunity. Without Nikolai's written consent, the deal won't go through. But will the neighbors regret searching for this tenant? Graffiti. The walls of Margarita Stanislavovna's building are covered in graffiti. She wants to know who's doing it. It would seem a common occurrence, but the "Forbidden Zone" agency was drawn to the fact that the wall of one floor near Margarita Stanislavovna's apartment, the one where she lives, is completely covered in graffiti, using only the word "ass." The program's agents will have to figure out who this message is addressed to and what it means.