Tom Swift and His Repelatron Skyway

From the very moment that Tom Swift Jr. agrees to help the government of Ngombia build a highway to link the jungle-separated provinces of the new African nation ñ a task that has stumped the best engineers in the United States ñ he is beset by mysterious attacks aimed to defeat the project.
Construction of the road is urgent. At stake is the economic future of this friendly country. But no conventional highway will do. For existing engineering methods can not be used to bridge the seething, bubbling swamp in the rain forest.