On June 25, 1973, a seven-year-old girl went missing from the Montana campground where her family was vacationing. Somebody had slit open the back of their tent and snatched her from under their noses. None of them saw or heard anything. Susie Jaeger had vanished into thin air, plucked by a shadow. As days stretched into weeks, and weeks into months, Special Agent Pete Dunbar attended a workshop at FBI Headquarters in Quantico, Virgina, led by two agents who had hatched a radical new idea: What if criminals left a psychological trail that would lead us to them? 

Nashville - a haven for aspiring musicians and a magnet for country-music fans. By the time Pat Postiglione arrived there in 1980, it was also the scene of an unsolved series of vicious sex slayings that served as a harbinger of worse to come. As Postiglione was promoted from street-beat Metro cop to detective sergeant heading Music City’s elite cold-case Murder Squad, some of America’s most bizarre, elusive, and savage serial killers were calling Nashville home. And during the next two decades, the body count climbed. 

Despite advances in DNA evidence and forensic analysis, almost half of murder cases in Canada and the US remain unsolved. By 2016, the solved rate had dropped so significantly in the United States that it was the lowest in recorded history, with one in two killers never even identified, much less arrested and successfully prosecuted. And the statistics are just as bad in Canada.

For years he'd stalked elementary schools and playground looking for young girls from low-income neighborhoods to abduct, rape and murder. He thought of them as "throwaway kids" - hardly missed, and soon forgotten, except by those who loved them. He was ever parent's worst nightmare. The bogeyman they warned their children about ... the fiend who lurked outside bedroom windows.

Best friends Daryl Barber and James Boucher were responsible, and their parents trusted them to spend Spring Break at Daytona Beach unchaperoned. When the boys missed their agreed-upon daily check-ins, their parents were disappointed. When they failed to come home on their planned return date, their parents were terrified. They could not have known that their innocent sons would encounter two violent men on the Florida coast. They could not have imagined the torture their children would endure before their bodies turned up four months later in a Florida swamp.