Exclusive new details about the investigation into the murders of four University of Idaho students are revealed; featuring never-before-reported evidence that investigators say track the accused killer's movements.

A quiet North Dakota college town is left in fear after 22-year-old student Mindy Morgenstern is found murdered in her off-campus apartment. Detectives investigate neighbors, friends and boyfriends before they discover the killer hiding in plain sight.

INTERVIEWS WITH: Larry and Eunice Morgenstern, Jason and Rebecca Young, former North Dakota Bureau of Criminal Investigation Agent Mark Sayler, Prosecutor Jonathan Byers, and more.