Security guard Ray Jennings was convicted of killing eighteen-year-old Michelle O'Keefe at a parking lot where he worked in 2000. Eleven years later he was declared innocent. If he's not guilty, how did he know things only the killer could know?

It's been over thirty years since a brutal serial killer terrified this tropical paradise, savagely murdering five young women. Although he was never caught, new clues and eyewitness accounts offer strong evidence that this case can now be solved.

In 2001, 32-year-old Rebecca Zahau was found dead, hanging naked, her hands bound behind her back. It had all the signs of murder, but police ruled it a suicide.

The death of 21-year-old student Christopher Jenkins on Halloween night in 2002 is investigated. Included: whether he fell from a bridge into the Mississippi River by accident, committed suicide or was murdered. Also: whether a mysterious island holds the answers.

Nineteen-year-old college student Faith Hedgepeth was brutally murdered in 2012 and her killer has never been found. Questions surrounding the case include who sent the text message from her phone after she was already dead; and who wrote a mysterious note found on her body.

The series premiere focuses on the abduction-murder of 7-year-old Michelle Norris, who disappeared from a playground in 1986. Her body was found in nearby woods several days later. Clues point to the murderer being someone who lived in the neighborhood.