February 13, 2017, was a warm day in Delphi, Indiana, and friends Abby Williams and Libby German set out to enjoy a bonus day off of school. They headed to the trails at the Monon High Bridge, a popular place for locals to go and enjoy the outdoor gem. Abby and Libby never made it home and the next day the girls' bodies were found in the surrounding woods, setting in motion a mystery of who could have killed them. This mystery has only deepened  after evidence was found on Libby's phone that many thought would break the case. But after four years, the killer is still out there.