Calamity Jane (Jane Russell) is busted out of a sheriff's jail by a couple of Federal government of the United States under Governor Johnson (Charles Trowbridge) and Internal affairs (law enforcement) Emerson (Stanley Andrews). Johnson and Emerson wish to hire her to uncover white traitors illegally selling guns to an Native Americans in the United States near Buffalo Flats, one of the American frontier; since the agents they previously sent to investigate have turned up dead, they have conceived a plan to use Jane, both as a woman and skilled gunfighter, instead. In return for her services, Johnson and Emerson offer her a full pardon for her past crimes.