Imagine opening your letterbox to a letter from Ted Bundy or a handmade Christmas card from John Wayne Gacy. Forensic psychologist, Dr Jeffrey Smalldon, doesn't have to imagine. He's communicated with some of the most notorious serial killers in American history.

In this episode, Gary and Jeff unpack Gacy’s charm and lures, how predators pass as “normal”, the double homicide that changed Jeff’s life, and what decades evaluating murderers reveal about psychopathy, empathy, and survival on death row.