"Based on the popular series of novels by Elena Mikhalkova" "Investigations of Makar Ilyushin and Sergey Babkin "". A young woman, Anna, lives outside the city alone in her parents' house: her mother died long ago ago, her father was killed a year ago. Once a month someone sends her money, and Anna suspects that this man has something to do with the murder. And it seems that there is a maniac in St. Petersburg, killing passers-by in the arches a year ago, wakes up again. Soon private detectives Makar Ilyushin and Sergei Babkin take up the case. Such a case: they were contacted by a woman whose brother Nikita had recently disappeared. She claims that the young man, recently killed by a maniac, is one of Nikita's friends at the institute. And Nikita Lately he himself thought that someone was watching him from the house opposite. This Anna's house.