In the Yaak Valley of northwest Montana, the worst fire season in living memory threatens the home of Tom Oar. In Alaska, Marty Meierotto flies into the heart of a vicious storm on his annual journey to his remote winter trapline. Turtle Island, Eustace Conway's refuge in the Blue Ridge Mountains, comes under threat from developers. And a new mountain man, lion hunter Rich Lewis, leads his dog team through Montana's Ruby Valley in pursuit of a deadly puma.