We are two seasons into Netflix's Mindhunter now. The series, centred firmly on some of America's most infamous serial killers, has captured quite the following.
While the story revolves around agents Holden and Tench and their ongoing sub-plots, the main attraction for most viewers is the interaction with the likes of Ed Kemper, Richard Speck, and Charles Manson.
Despite committing horrific crimes - which in no way should be glorified - there's definitely something intriguing about the mental state and thought process that drives these people to carry out such atrocities.
Series creator Joe Penhall does a good job of keeping the viewer in suspense and invested in all aspects of the show, without revealing or displaying too much brutality in the way of actual scenes. It would arguably take away from what the focus of what the programme is about if we did see murder after murder in front of our eyes. Mindhunter is, after all, meant to introduce the viewer to how the FBI came to develop criminal profiling.
And while we get an insight into just how some of the world's most heinous serial killers operate, not everything is given away.
These are equally interesting and disturbing people and there's even more out there to delve into if you look a little closer at their characters...
10. Paul Bateson Was In The Exorcist
Bateson was convicted of the 1977 murder of film industry reporter, Adam Verrill. He had lured Verrill back to his apartment after a night on the town and then brutally stabbed him to death after having sex with him.
He was subsequently convicted after being unable to keep his mouth shut. However, Bateson had a deeper history what led back to him actually appearing in 70s cult classic, The Exorcist.
A radiographer by trade, Bateson was given the chance to be part of the film when director William Friedkin and his crew descended on NYU Medical Centre back in 1972. Keen to get a real feel for his scenes, Friedkin allowed Bateson to be a part of the scene, even giving him a small speaking part throughout.
It's hard to make any links between this scene and Bateson's behaviour later in life but it's certainly unsurprising, given the so-called curse the film had on a number of its crew members.