This series focuses on the development by two men, two agents, of a new criminal field and does so through story lines of visiting the sociopathic mind. Mindhunter is based on the 1996 book Mind Hunter: Inside the FBI's Elite Serial Crime Unit, by former special agent John Douglas and Mark Olshaker.
In "The Sinner", overcome by an inexplicable fit of rage, a young mother (Jessica Biel) commits a startling and very public act of violence - and to her horror has no idea why. The event launches an inverted and utterly surprising crime thriller whose driving force is not the who or the what - but the why. A rogue investigator finds himself obsessed with uncovering the woman's buried motive, and together they travel a harrowing journey into the depths of her psyche and the violent secrets hidden in her past.