The story “Grey-haired” from the series “Notes of an Investigator” by R. Lozhnov is a detective story based on real events. The author talks about the progress of the investigation into a criminal case involving several thefts that became the causes of even more dangerous crimes. The difficult everyday life of criminal investigation officers, their courage, high professionalism, devotion to duty and love for their native land make these people real heroes of our time. The book is intended for a wide range of readers.