In the setting of small town America during WWII, Mrs. Agnes Odboddy is an eccentric older woman who sees conspiracies and Nazi spies around every corner. She becomes involved with a black market scheme, missing Hawaiian money, a Japanese air balloon bomb and a suspected local Nazi spy. More chaos erupts when a long lost WWI lover returns to town wanting to re-ignite a romance and Mrs. Roosevelt comes to town. Agnes is called upon to prove she is, indeed, a hometown patriot and a warrior on the home front.
Planning to travel with Mrs. Roosevelt on her Pacific Island tour, Agnes is asked to carry a package to President Roosevelt. Sure that it contains 'secret war documents' she fully expects to ward off Nazi spies bent on stealing her package. Along the way, she meets a war veteran who unexpectedly lends her a hand, a woman traveling with a child, a man who appears to have murdered his wife, and is much too interested in her granddaughter, Katherine, already engaged to a doctor back home.
Only when she gets to Washington, D.C. does Agnes learn who is the real Nazi spy and faces a show-down that makes her realize the limitations she faces as and elderly woman, despite her sincere desire to be a home front warrior.