The main character of the series "Petrovich" is Ivan Kalugin, a former riot police officer. He is an adult and wise man who left his service many years ago in order to live a peaceful and calm life with his family in a fishing village. He has a beloved wife, an exemplary son, and a beautiful daughter-in-law, as well as friendship and respect from his neighbors. However, the quiet village life is turned upside down when Petrovich's younger wayward son, Semyon, returns to his father's house. He brings with him gangsters from the city who have long had a grudge against the elder Kalugin.