Jim and Arte investigate a rash of earthquakes. They discover a mad scientist named Professor Orkney Cadwallader is using nitroglycerin to set off the disasters.
After two Wyoming towns suffer devastating earthquakes, Jim and Artie travel to Sentinel, where fliers have circulated warning of the next quake. When that quake strikes as predicted, the agents realize that someone can create earthquakes whenever and wherever he wishes. They must discover who and how before the madman levels the Wyoming territory!—CommanderBalok