The gruesome murder of two young girls rocked the small town of Delphi, Indiana. Four years later, despite audio and video of the alleged killer, the case remains open and police believe the killer is still living among the town residents.

A brutal crime in the heart of America - two young girls murdered in plain sight. With a killer still on the loose, the community wants answers. In rare interviews, investigators reveal what they're doing to find justice for Abby and Libby.