Forensic investigator Ivan Fedorovich Volovtsov, having received a long-awaited vacation, goes to Ryazan, to his beloved aunt. He dreams of a relaxing holiday with a book in his hands, but his dream, alas, is not destined to come true. Immediately upon arrival, Ivan Fedorovich finds himself in the thick of tragic events. In a neighboring house, my aunt’s friend, the harmless old woman Marya Kokoshina, burned to death. Local police are inclined to believe that Kokoshina died as a result of an accident, but intuition tells Volovtsov that not everything is so simple in this case. Ivan Fedorovich carefully examines the place where the old woman died and comes to an unambiguous conclusion: Marya Kokoshina was killed...