Bosnovia, a strong foreign power noted for its advances in aerial navigation, succeeds, through its diplomatic secret service, in getting possession of the first model of Carlton's invention for detecting the coming of an aeroplane. The spies have injured the model by trying to disclose its secrets. Prior to this, Constance Chambers, United States Secret Service agent, has been assigned to the case and in carrying on her operations she has met the young inventor and fallen in love with him. Carlton has fallen in love with the girl also. While trying to rescue Carlton from danger, Constance is captured by the Bosnovian spies. Through threats of injury to her, Carlton is forced to give in to the demands of his captors and repair the machine which they have broken down in endeavoring to extract its ominous secret with their lack of experience. Constance, however, escapes with the aid of her chauffeur. The exciting pursuit by the Bosnovian secret agents and her wild ride for help on the ...
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