Bill and Bob Stone are twin brothers aged 72 who fled their adrenaline-junkie pasts for a tough subsistence lifestyle hidden away in Americaʼs Wild West. In this unforgiving landscape, even with one of them recovering from a stroke, they carve out an existence and fight the challenges associated with growing old. Ben joins these canyon-dwelling renegades in their remote, isolated home, deep inside some of the worldʼs most striking and wild terrain. There he joins the boys cattle-wrangling, rock climbing and sleeping in a cave. One of the twins even persuades Ben to do a skydive. Ben also discovers more about the Stone brothers and why they decided to cut themselves off from civilisation. Once parachute instructors, police informants and bounty hunters, they are now organic farmers and doomsday preppers.