Bob and his friends keep catching strange messages in the stuttering voice of Dan Cassey, and the puzzle follows them into the forest, where a ranger shows how radio helps fight fire. An escaped convict, a trap door and a pair of cunning scoundrels then test their wits and their wireless skills.
A Stratemeyer Syndicate series from the dawn of broadcasting, with a foreword by the wireless hero Jack Binns. Download the free EPUB.