Sixty-year old stonemason David Riemens has one final meeting to attend about a construction job before he drives from Tennessee to Michigan to visit family. But when he never returns home to collect his bags, and his truck is found abandoned in a local parking lot, friends immediately sound the alarm. Desperate to find him, investigators try locating the unknown construction site and look for clues in Riemens's unconventional off-the-grid lifestyle, but every avenue they explore leads to yet another dead end. The only indisputable evidence they have to go on is that Riemens has seemingly vanished into thin air.