He dined with the powerful. He preyed on the vulnerable. Beneath a smiling exterior was the horrifying darkness of a sadistic serial killer.

"Sam, could you do me a favor?" A seemingly simple request sparks the story that has now become part of America’s true crime hall of fame - the journey of a young lawyer, fresh from the Public Defender’s Office, whose first client in private practice turns out to be the most evil serial killer in our nation's history.

A documentary covering various serial killers including BTK, Jeffrey Dahmer, John Wayne Gacy, Ted Bundy, Son of Sam and more.