I'm not easily scared, but this book really made cold shivers run down my spine. The reason for that is that the subject matter of "Mindhunter" is not the fantasy of an author's creation, but is true facts about real people. We watch horror movies and think, "Nobody could be like that", and feel safe in our knowledge that when the film is over, the horror goes away. Read "Mindhunter" and realise that there are people like that. The things they do make your skin crawl and it is not a story. Neither does it go away ! Not, at least, until they are caught and "Mindhunter" is an account of how forensic psychology does just that. Riveting stuff !