Along a desolate stretch of highway, police discover the bodies of 10 murder victims. Police realize they are all connected to the sex trade, but the trail quickly goes cold. Five years later, the identity of the killer remains a mystery.

Amateur profiler Peter Brendt's shocking reveal that not just one but two active serial killers are responsible for the 10 bodies discovered along Ocean Parkway compels Josh and Rachel to examine a series of mysterious torso killings.

In the wake of Shannan Gilbert's funeral, family lawyer John Ray presents Josh and Rachel with confidential testimony that implicates a local doctor and Oak Beach resident in the death of the young escort.

Josh and Rachel continue their search for the Eastbound Strangler in Atlantic City. They revisit the motel where the bodies were dumped and tour the site with a man who was the police's person of interest at the time.

Josh and Rachel are in Florida looking into the case of the Daytona Beach Serial Killer. A chance encounter with the daughter of one of the victims propels them to investigate a string of leads, including a former junkyard owner with a dark family secret.

After a private investigator's alarming revelation that some long-haul truckers are serial killers terrorizing America's interstate system, Josh and Rachel begin a cross-country journey to research these killers on wheels.

Discovering that the current systems in place to detect serial killers are severely broken, and suffering from an inability to connect the dots, Rachel and Josh head to New Mexico to experience firsthand just how bad things have become.

With the help of local advocates and ex-FBI, Rachel and Josh are searching for eight missing women on Albuquerque's West Mesa when they discover they may be dealing with something even more sinister than a lone serial killer.