How far are some people willing to go to keep a secret? In 2021, Chandler Halderson told police that his parents, Bart and Krista, were missing after a trip to their family cabin north of Windsor, Wisconsin for the Fourth of July holiday weekend. But Chandler became a prime suspect after lying about his activities in the days leading up to the holiday. Police then got a final break in the case from Chandler's girlfriend, whose account on the popular social media app, Snapchat, tracked Chandler’s location to a remote spot along the Wisconsin River during the time of his parent’s disappearance. When deputies searched the area, they made a gruesome discovery. Erin Moriarty takes you even deeper into the "48 Hours" investigation, "The Snapchat Clue".