Inferno Of Fear

the long version

"When you rise to the height of danger, you always risk a swift and deadly fall! The Hardys have come to Alaska's Denali National Park to experience the awesome power of America's final wilderness. But in the face of a disastrous series of forest fires, they discover that the true test of survival will pit them not against natural forces -- but against human evil. For the fires have been deliberately set. With crime -- and the flames -- raging out of control, the boys leap into action, joining a crack team of parachuting fire-fighters. They uncover a trail of destruction, greed, and arson for profit, which leads them directly into the line of fire. The sparks are flying, and Frank and Joe are about to descend into the fight of their lives!" (Hardy Boys Encyclopedia 1994)