What's the story?

The Netflix crime thriller Mindhunter returns for series two on Friday (August 16).

A brief summary before we proceed, please?

It follows FBI agents Holden Ford (Jonathan Groff) and Bill Tench (Holt McCallany) as they probe the psyches of those who have done the unthinkable.

With help from psychologist Dr Wendy Carr (played by Fringe star Anna Torv), they use their ground-breaking behavioural analysis to hunt serial killers.

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This sounds dark and a tad terrifying.

It certainly is. The TV show is based loosely on a true story. The idea came about when actor Charlize Theron gave a copy of the book Mindhunter: Inside The FBI's Elite Serial Crime Unit to director David Fincher. Theron is an executive producer.

What can we expect from series two?

Chalk-and-cheese pairing Ford and Tench attempt to catch the "Atlanta Monster", a suspected serial killer who murdered at least 28 African American children and young adults between 1979 and 1981.

It also stars Damon Herriman as notorious cult leader Charles Manson, the same role that the actor plays in Quentin Tarantino's film Once Upon A Time In Hollywood, due out next week.

There will be nine episodes in the latest series.

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Not one to watch right before bed, then?

As Nick Ross used to say on Crimewatch: "Don't have nightmares, do sleep well."