I'm a couple years late but Mindhunter is perfect for October. I tried to watch it a couple years ago, but that was when my gf and I first started dating and it got Netflix and Chill'd. It's about the FBI agents that started to study serial killers before they came up with the term serial killer, and the profiling and stuff they do to try and figure out how someone like that thinks and acts. So on the show you see them interviewing all these famous serial killers like Son of Sam, Ed Kemper etc. I gave it another show a couple weeks ago and finished it in like a week.
Its a really good show and no just because they have all these famous killers. Its actually extremely well rounded. Cinematography would have some appreciation for the editing, camera work and perfect soundtrack. Some of my favorites songs are scattered throughout the show.