Octavo, pp. [1-4] 5 vi [7-8] 9-396, eight inserted plates with 2 illustrations only by Edward S. Hodgson, original pictorial blue cloth, front and spine panels stamped in black and gold, all edges stained green, plain endpapers. Boys' adventure tale moving from England (where the young protagonists befriend a scientist with an advanced jet powered by "broadcast" electricity) to Canada to Mongolia to Africa.Another Science Fiction tale by Lieutenant-Colonel Frederick Sadleir Brereton, (1872-1957) who was a British Army medical officer and an author of children's books on heroic deeds conducted in the name of the British Empire some other of which are listed here