The U.S. has finally entered World War I. Constance Kopp is chasing down suspected German saboteurs and spies for the Bureau of Investigation while Fleurette is traveling across the country entertaining troops with song and dance. Meanwhile, at an undisclosed location in France, Norma is overseeing her thwarted pigeon project for the Army Signal Corps when Aggie, a nurse at the American field hospital, is accused of stealing essential medical supplies. The far-flung sisters correspond with news of their days. The world has irrevocably changed. Will the sisters be content to return to the New Jersey farm when the war is over?