In 2017, 22-year-old Jayden Penno-Tompsett vanished from the bush beside the Flinders Highway during a New Year road trip. The coroner ruled out foul play, but Jayden's mum thinks otherwise. In this final episode, the experts consider whether there are multiple active serial killers at work here across the decades, and many more victims than have ever come to light. Hundreds of miles; vast tracts with no phone reception, CCTV or another soul in sight; backpackers, hitch-hikers, small off-roads and cattle tracks; no police. It's the perfect place to get away with murder