Wanted - 7 Fearless Engineers!

In a world on the brink of transformation, the fate of a great civilization rests in the hands of Dick Barrow. Leading a band of intrepid engineers, they venture into a mysterious and uncharted territory, unaware of the perils and treasures that lie ahead. Yet, when posed with the daunting question, Are you a brave man? they stand resolute, ready to face the unknown. (Summary from jacket blurb/intro) Written by F. Orlin Tremaine under the pseudonym, Warner Van Lorne.