On the evening that timid librarian Cinnamon Schmidt and her mother are to entertain her fiance Hobart and his mother at serene family dinner, Cinnamon comes home in shock because she has witnessed a bank robbery and is the only one who can identify the crook. She confides her terror to chum Deedee Malone, not daring to tell her mother and then federal agent Joe Shimko arrives having gotten a tip that the robber, Orville Maddox, is en route to bump off the witness. The pace is rapid fire, the dialogue hilarious, and the laughter non stop.