Mitrofan is an adult with Down syndrome, who lives alone in the parents’ apartment. Everybody in the house likes him, from the old men playing chess to the children. For them, he is a superhero, managing the light of the entire city. Mitrofan works in a dispatch office, where every day he switches on and off the street lights. His daily schedule is extraordinarily exact: he goes to the bus stop, the tram approaches, he returns and is met by the mongrel Pepsi. But one day the usual routine is disrupted. Can Mitrofan find the meaning of life again?