Hell's gate

When lawyer Hunter Lee leaves the New York City rat race that made him rich but cost him his marriage, he sets out to build a new life in Fort Mason, Montana. His friend Paul Brule, a fire jumper, shows him the reality of vast tracts of forest reduced to ash in seconds by hundred-foot walls of flame. Hunter comes to suspect that this particular rash of summer fires is anything but accidental and could be serving a more sinister purpose--From publisher description.