The narrative follows Ruth Alden, a young office manager in Chicago who admires a returning flier, Lieutenant Gerry Hull, and is drawn from civilian life into direct wartime service. She travels to the Western front, participates in reconnaissance and resistance, encounters battles, secret messages and an underground railway, confronts imprisonment and daring raids behind enemy lines, and helps carry crucial intelligence. The story traces her growth from ordinary worker into an active agent of the war effort, exploring themes of courage, loyalty, resourcefulness, and the moral costs of conflict until the war’s end.