His heroes are three boys who, thanks to a fit of curiosity, find themselves aboard the Wonder Machine, adrift in the stratosphere. This extraordinary craft is fitted with a variety of inventions to which wireless, as we know it is simplicity itself. Thus they presently find themselves in touch with Mars - and the Martians, hostile and yet further advanced in science, try by some startling methods to destroy the Wonder Machine as it approaches their planet. escaping, they eventually make their way back to Earth. This is just the yarn for the boy interested in radio, television, and their just-possible developments.