Boris Krylov, super expert in forensic science, is a real Sherlock Holmes, whose paradoxical method allows to solve the most complicated crimes. Due to personal drama - parting with a beloved woman and divorce from his wife - he left his job in the forensic laboratory at a police department and stopped teaching at the police academy. He makes his living by advising film teams that film the series about criminologists. However, working as an adviser is not as carefree as it might seem at first glance.