Her Country First (1918)

During World War I young Dorothy Grant comes home from finishing school and informs her parents that she is going to contribute to the war effort by organizing a Girls Aviation Corps She has uniforms made and hires a veteran of the SpanishAmerican War to teach her cadets military routines and drills Her father owns a munitions factory and is always telling her to be on the lookout for spies She convinces herself that the family butler Williams is a spy because he cuts his grapefruit in an odd way It turns out that Williams isnt a spy but the people whom Dorothy least suspects are in fact spies and they discover that Dorothy knows the password to get into the factory after hours