Retired Detective Ken Mains teams up with an inmate on death row to expose the secrets of unknown serial killer Joseph Naso. While bringing closure to a victim's family, Ken uncovers that Naso likely killed many more women than police ever thought.

Bill Noguera gets a written confession from serial killer Joseph Naso, cracking open another cold case from his List of 10. Detective Mains uncovers more potential victims from an infamous case in New York.