Matthew and Wilma Mason, a retired couple from San Francisco, set out on a driving tour of the Southwest’s national parks. But their journey ends in the desolate backcountry of southeast Utah, where both are discovered shot to death. A revolver in Matthew’s hand points to murder-suicide—but Deputy Sheriff Manny Rivera isn’t convinced. Too many details don’t add up. Why did the Masons, both 68, abandon the route carefully marked on their map? What drew them from smooth highways onto rugged, isolated back roads? Why stop beside a long-forgotten grass airstrip? And perhaps strangest of all—why were they dressed as if they had stepped straight out of the 1960s?