In the idyllic town of Delphi, Indiana, Abigail Williams and Liberty German set out for a walk and never returned home. Their bodies were found the next day. What made this case unique and terrifying worldwide was that, just before the murder, Libby managed to capture a short video and audio recording on her cell phone of the perpetrator (who became known as "Bridge Guy") walking toward them and saying, "Down the hill." This set in motion a five-year search that gripped the country and haunted this close-knit community.