Halloween in a small town is cancelled indefinitely when a young girl is kidnapped and killed on her way home from a costume party.

A family torn apart by their grandparents' murders. Two decades later, a cold case detective takes on the case that has haunted him since he was a child, racing to solve it before the family take matters into their own hands.

The case of a gruesome stabbing death of a bullied teenager remains unsolved for 27 years.

A killer authors a book about his con-man past that becomes the key to solving a 29-year-old cold case of two high school sweethearts -- and three other cold case murders -- leading police to believe he could be the Zodiac Killer.

College student Brad Perry shows up to work his graveyard shift at the gas station and is never seen alive again.

The longest-running cold case of a law enforcement officer in the United States was the murder of Sheriff's Lt. Joe Clark.

When 18-year-old Shannon Siders' body is found in the woods, everyone in the small town of Newaygo, Michigan, becomes a suspect -- but no one is convicted of the crime.

A 17-year-old girl goes missing in a small Kentucky town. Two weeks later, she is found strangled in the woods. It will take more than a decade for a cold case detective to solve the case.

One family faces two unsolved murders of their loved ones. It takes 13 years for detectives to uncover the one missing clue that can lead them to the killer: the hidden crime scene.

The loving aunt of a close-knit family is stabbed to death in her home. It takes two decades for detectives to discover that a key witness was an imposter -- and caused the case to go cold. When they turn back to the crime scene, they discover a clue.