A mother and her two young sons vanish in rural Wyoming, prompting a nationwide search. Leads dry up and the case goes cold... until the revelation of a dark secret leads police to a homicide.

Ernest and Charlene Scherer are found beaten and stabbed to death in their exclusive Northern California community. Police believe it was a robbery gone wrong until investigators hone in on the motive and learn about the killer's twisted double life.

When Special Forces Major David Shannon is fatally shot in his family home in Fayetteville, NC, investigators wonder if his job made him a target.

Bloomington, IL, Sergeant Jeff Pelo is a respected police officer and, at home, he's a model father and husband. When he's caught trespassing after midnight on a young woman's property, his spotless reputation comes under fire.

The decomposed body of a San Francisco businessman is found floating in the California Aqueduct in Tracy, CA. Investigators initially suspect a family member, but without evidence, the case goes cold and It takes detectives several decades to find the real killer.

When dozens of women vanish from the Sunshine State in the late '60s, the get filed as presumed runways; police discover the bodies of two missing teens, uncovering the sadistic work of a prolific serial killer.

Mike Dixiano is heartbroken when his wife, Angela, dies from organ failure after a lifelong battle with drugs and alcohol. While friends and family grieve Angela's death, investigators can't find a death certificate and begin to suspect her husband.

Dana MacKay is found beaten to death while her husband is out of town and the prime suspect is a woman who has been stalking MacKay for a month's time. Then, an X-rated text message comes to light to unravel the mystery.

Wife and mother Stephanie Roller Bruner vanishes in a blizzard shortly before Thanksgiving, prompting officers to launch a massive search. Then, the sordid details of a secret love triangle emerge, causing the case to take a twisted turn.