The investigation into the disappearance of a Wyoming mother and her two young sons goes cold until the revelation of a dark secret leads police to a homicide.

Police believe the beating and fatal stabbing of a Northern California couple was a robbery gone wrong until investigators hone in on the motive and learn about the killer's twisted double life.

Investigators wonder if the fatal shooting of a Special Forces major was connected to his job, but a deeper inspection of the victim's personal life reveals sordid secrets.

Sergeant Jeff Pelo is a respected police officer and a model family man, then he's caught trespassing on a young woman's property after midnight, and his spotless reputation comes under fire.

The decomposed body of a San Francisco businessman is found floating in the California Aqueduct. Investigators initially suspect a family member, but without evidence, the case goes cold. 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.