To get a better understanding of what happened that day, the team goes to Delphi to walk the trail, stand at the bridge, and explore where - and how - it all happened.

Abby and Libby - 2 young girls murdered. Investigators are searching for the killer using their biggest clue: a recording of his voice from one of the victims' phones ordering the girls Down the Hill. Almost three years later, it's a mystery that still haunts the small town of Delphi, Indiana while police say the killer may walk among them.

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