Me and the mrs have just re-watched Mindhunter.
I enjoyed it even more than I did the first time round, what an incredible piece of television. Such a shame David Fincher / Netflix cancelled it. On the reddit group someone quoted an interview with David Fincher where he said he originally envisaged it as being in five seasons, but they only made two.
The guy who played Ed Kemper was fantastic. Terrifying how sort of 'friendly' he was considering the horrific crimes he committed.
The guy chopped off peoples heads and had sex with them, takes some doing that.