The giant city is a closed world for all its inhabitants. It is impossible to leave the city because no one knows where its border is. Everything is run by Infor - the main computer, which was once created to meet the needs of the citizens, but over time became the absolute master of the City, managing people's lives according to its own understanding. The conditions he created are so ideal that people do not have the slightest need to leave their apartments: even when visiting, they “walk” on video monitors, creating the complete illusion of presence. But then there is one writer who, first out of pure curiosity, goes out into the street, and then, seriously intrigued, decides to find where the City ends. The computer begins to take revenge...