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?

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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?

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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.