The chilling true story of a newly married FBI poster boy assigned to an Appalachian mountain town in Kentucky. There he is drawn into an illicit affair with an impoverished local woman who becomes his star informant. She sees in him her means of escape; instead, it's a ticket to disaster for both of them.

Sam identifies himself as a psychopath. Filmmaker Ian Walker takes him on a diagnostic journey to be analysed by psychologists and neurologists. But Ian hasn’t considered the reality of spending time with someone with a serious personality disorder, or the effect that the diagnosis will have on Sam himself – or his wife.