An autopsy reveals that Betsy Aardsma was stabbed with near-surgical precision, leading state troopers to conclude the killer was a highly intelligent stalker. But in this still-open case, the full list of suspects ranges beyond stalkers—from Betsy’s classmates to her professors to famous serial killers. Carter and Wenndy take a second look at this suspect list, and come across a jilted lover out for revenge.