A sleepy Pennsylvania town is rocked when a popular dentist is discovered lying in a pool of blood. Police uncover few clues but plenty of rumors. Was the motive money or passion? And can the police be relied upon to investigate one of their own?

Parceled into a series of plastic bags, the dismembered body Karyn Slover is found floating in an Illinois lake. An autopsy reveals she also suffered multiple gunshot wounds to the head. After 2 years and no leads, can forensic science crack the case?

A serial killer is on the loose in the college town of Gainesville, Florida. And although police close in on their prime suspect, they fail to establish a forensic link and the case goes cold. But can they find the culprit before he strikes again?

Spring Hill, Florida, is rocked by a series of violent crimes. All signs point to a serial killer with a taste for elderly women and fire, but police and the FBI find little evidence to solve the case. Can investigators track down the culprit?

An international media sensation erupts when a British exchange student is brutally murdered in the Italian university town of Perugia. With her throat slashed, Meredith Kercher's half-naked body is found in her locked bedroom. And, with the case making headlines around the world, police are under tremendous pressure to find a culprit fast.

In Michigan, a 15-year-old is abducted and strangled, her naked body dumped in a nearby orchard. Police line up a slew of suspects, but the case goes cold. But ten years later, a grand jury dusts off the case, and finds the truth has been there all along.

A pretty Brooklyn college student disappears after a night out, and police are convinced she's been abducted. Two days later, her remains are found in an empty home. Police assemble a list of possible culprits, including an ex boyfriend named Pyscho.

Near Chicago, seven fast food workers are gunned down and their bodies left in the restaurant's walk-in freezer. With the community's residents reeling, and the media clamoring for answers, police struggle to piece together the deadly puzzle.

When the body of a San Diego man is found in his burned car, investigators begin a bizarre murder mystery. Many people are possible suspects, but the case goes cold. A woman makes a confession, and a tale of jealousy and cold-blooded murder is revealed.

Just outside Memphis, an affluent Tennessee community is stunned when, in the early morning hours, a gentle, much-loved McDonalds manager is brutally attacked and left for dead on the floor of the restaurant. In critical condition, she's rushed to the hospital where she dies soon after.