Shirley Davenport is as much a patriot as her four brothers. She, too,wants to aid her country in the war efforts, but opportunities for women arelimited. When her best friend Joan informs her that the Coast Guard has openeda new branch for single women, they both enlist in the SPARs, ready to help protectthe home front. Training is rigorous, and Shirley is disappointed that she andJoan are sent to separate training camps. At the end of basic training, CaptainWebber commends her efforts and commissions her home to Maine under the ruse ofa dishonorable discharge to help uncover a plot against the First Lady. Shirleysoon discovers nothing is as it seems. Who can she trust? Why do the people sheloves want to harm the First Lady? With the help of Captain Webber, it's a raceagainst time to save Mrs. Roosevelt and remain alive.