188 pp. "Don Craig and his troop are camping alongside of the Fairbank's Flying Field where Scoutmaster Garry Foster is stationed as a flying forest ranger. For irrigation purposes a great dam is being built above the town of Denning nearby, even against the wishes of Milo Barbour His hostility to the project takes a serious turn one night when the boys run into Frank Dusong, a former criminal, and a truck load of dynamite."
