Mindhunter, Netflix’s true crime drama series, follows a duo of FBI agents — Holden Ford (Jonathan Groff) and Bill Tench (Holt McCallany) —  as they study the methods and motivations of serial killers in the 1970s. Based on the real-life experiences of former FBI agent John Douglas, Mindhunter verges on historical fiction, recreating several of Douglas’s cases but adding narrative twists to keep things even more interesting. Douglas, like Holt in the show, pioneered the practice of psychological profiling — especially of serial killers — during his 25 years with the FBI.