A mysterious train accident on the outskirts of Coronaville interests the Music Master, especially because farm animals found near the scene were either dead or deaf! He discovers the Nazis are using a secret weapon, called the Sound-o-Graff, to accomplish this.; Wade Ferris sends for Pat Dempsey because he is concerned that his business is about to be wrecked because of the coal shortage, and that a plot is afoot to do just that! When Pat appears as a new miner wanting work, he hears about the ghosts of Indians in the mine, but later discovers that the mine may be full of diamonds.