A scientist has invented a silent airplane motor of tremendous potential benefit to aeronautical and military concerns. But a plot is underway to steal the plans. Lloyd Darrell, a secret ser... Read allA scientist has invented a silent airplane motor of tremendous potential benefit to aeronautical and military concerns. But a plot is underway to steal the plans. Lloyd Darrell, a secret service agent, disguises himself as Bill Smith and covertly endeavors to prevent the theft.A scientist has invented a silent airplane motor of tremendous potential benefit to aeronautical and military concerns. But a plot is underway to steal the plans. Lloyd Darrell, a secret service agent, disguises himself as Bill Smith and covertly endeavors to prevent the theft.
