Filming for the wrapped in December of last year meaning the editing process is officially underway. As for the plot, season two will be based around the infamous cult leader Charles Manson.
"He’s probably the most famous of all the criminals they tackle," Penhall said. "Manson is a great example of a self-publicist if there ever was one. A classic narcissist. Fame was incredibly important to him. You know he started out trying to be a rockstar, and became very disgruntled with Hollywood. I think you'll see Holden's growing narcissism, as well as his awareness of how much power he wields."
Set in the late 90s, season one— which is based on the true crime novel by John E. Douglas and Mark Olshaker— follows FBI agents Holden Ford (Jonathan Groff) and Bill Tench (Holt McCallany) as they interview some of the world's most twisted killers in an attempt to understand what makes them tick.
The unlikely partner's profile perverted murderers like Dennis Rader (Sonny Valicenti), otherwise known as BTK (Blind, Torture, Kill)— an acronym which stands for his preferred method of killing. Between 1974 and 1991, the infamous criminal murdered 10 people.
Last season also featured Ed Kemper (played by Cameron Britton) who killed his grandparents as a teenager and later kidnapped, tortured and slaughtered eight more people from 1972 to 1973. Interestingly, the show quoted directly from real interviews conducted with the criminal from his prison cell.
If all goes to plan, Penhall said he has plans for three more seasons!