On August 5, 1949, a crew of fifteen of the United States Forest Service's elite airborne firefighters, The Smoke Jumpers, stepped into the sky above a remote forest fire in the Montana wilderness. Two hours after their jump, all but three of these men were dead or mortally burned from a "blowup" -- an explosive, 2,000-degree firestorm 300 feet deep and 200 feet tall -- a deadly explosion of flame and wind rarely encountered and little understood at the time. Only seconds ahead of the approachi...