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In 1979, a 16-year-old girl is last seen alive at Dairy Queen in Las Vegas.

In 1981, a mother of two is found murdered in her home in Florida.

An investigation of abuse allegations against one of the owners of religious reform school Circle of Hope.

In Kansas, a prison volunteer helps a man escape custody; investigators scramble to track the pair down.

A Philadelphia murder reveals decades of misconduct in the city's criminal justice system and raises questions about whether police caught the right person; key insiders in the case speak out for the first time on national television.