Phelps and Kelly investigate the unsolved murders of four couples on a remote lovers' lane in Virginia, attacked in their cars by a serial killer who may be posing as a cop. 

Four young girls go missing in Massachusetts and Connecticut. Some turn up dead, some are never seen again. Phelps and Kelly investigate the murders which are decades apart but with one thing in common: blonde hair and blue eyes. But are they connected in another way? Are they victims of the same serial killer?

Phelps and Kelly take a grim trip to the seaside town of Newport, OR, to investigate the unsolved murders of five teen girls. The bodies of local girls have been turning up dumped in the forest, and it looks like the work of a serial killer. But who is he? And what twisted clues could he have possibly left behind?

Phelps and Kelly investigate the 1982 murder of a New Jersey woman, Jane Goodwin. Was it a serial killer responsible for similar murders in Connecticut and New Jersey? Phelps is convinced he's got his man, a convict he's corresponded with for years. But can Phelps make him confess?

Phelps and Kelly head to Boca Raton, FL, to investigate a series of kidnappings and murders. In March and December 2007 two women were shot dead as they left the same shopping mall. A robbery gone wrong? Or the work of a serial killer?

The discovery of a naked woman's body on Ocean Parkway in 2011 was just the beginning. How many women has the Long Island Serial Killer brutalized and murdered? Phelps and Kelly are hot on the trial, looking for clues in order to stop this terrifying madman.

Phelps and Kelly enter the frightening world of Israel Keyes, who may be one of the worst serial killers we've ever seen. He took great care in hiding his victims, which means finding them has become a new nightmare.

Between 1978-1988, seven women are brutally stabbed and dumped in the woods of the Connecticut River Valley. Phelps seeks answers from a woman who survived the serial killer's attack and may be able to identify a new person of interest in the case.

From 1996-98, someone terrorized the elderly residents of Columbus, MS, brutally killing 5 senior citizens in their homes. But local law enforcement and a secret source have Phelps and Kelly wondering if they're looking at a serial killer.

The billboards on Canada's Highway 16 read: Girls, don't hitchhike on the Highway of Tears. Phelps and Kelly head deep into the Canadian wilderness to investigate the mysterious disappearances of over 30 women on this remote highway. Is it one killer, or multiple serial killers? Will it ever be safe again?

Between 2003 and 2007, five down-and-out women go missing in Worcester, MA. Their remains are found in wooded areas outside the city. Phelps tracks the hunter, following the trail of evidence.

From 1976-77, a pedophile abducted and murdered four children from affluent Detroit neighborhoods. Phelps travels to the dark side of suburbia to ask: What kind of monster bathes, cleans and dresses his victims in fresh clothes after he kills them?

What kind of serial killer removes his victims’ shoes and socks, then lays the bodies facing east? Phelps heads to Atlantic City to investigate the 2006 murder of four sex workers to see if they are connected to a breaking case on Long Island.

Torrey Pines Beach, CA is an idyllic place, but it's also been the scene of horror where two teenagers were murdered 30 years ago, and there is still no justice. Phelps and Kelly retrace the final hours of the victim's lives and uncovers new clues.