Agents West and Gordon have been investigating a series of explosions that have demolished several palatial homes. While they are guests of the wealthy Mr. Taney, they hear a high, whining sound. Suddenly the house begins to crumble and the agents escape in the nick of time to see a giant tuning fork radiating powerful sound waves. As they delve deeper into the case, they discover a letter to Mr. Taney from the Cyclops Insurance Company, urging him to take out a policy against further destruction of his property.

West becomes involved with the Jupiter Corporation after the director of the board and two others are killed. West exposes a deep plot by the late director's sister,Amelia,to dump stock,cause a panic,then make tons of money off of the cheap stock. West's investigation leads him to an odd bar with a cirus theme and animals who like to throw bombs. West uncovers Amelia's plan to kill off the rest of the board and is able to save the rest of the members.