Martina, a schoolteacher, and her three friends embark on a crazy experiment to test the theory which states that a human's body functions best when its alcohol in blood level is kept at 0.5.
Black cowboy Jim Kelly is known on the Texas frontier for killing cattle rustlers. When he befriends the widow of a murdered sharecropper and her daughter, Jim must decide whether to seek vengeance or leave behind a life of violence.