On Halloween night, 2001, a bright Penn State student named Cindy Song vanished into the cold air of rural Pennsylvania after a night out with friends.

Only a few scattered clues would ever surface, each stranger than the last.

What happened that night has haunted her friends, detectives, and an entire community for over two decades. In this episode of Unexplained, we go back to that night - and to the darkness that followed.

Written by Richard MacLean Smith and James Connor Patterson

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