At 2:00 am on June 17th, 2019, 23-year-old Mackenzie Lueck got off a plane in Salt Lake City, took a Lyft to a suburban park, and then vanished. Police followed the digital breadcrumbs left by Mackenzie to a house where a slew of nightmarish clues were discovered—clues that told the story of Mackenzie's fate and lead to the arrest of a suspect. On episode 49, Jac, Alexis and Billy speak with a first degree connection—a woman who encountered the suspect on a dating app and actually met him for a date. They detail his chilling characteristics, his reported need to build a sound-proof dungeon in his home, and explore the complex dichotomy of straddling dating and safety in an ever-evolving world of technology.