The true story of Marcenia Lyle, an African American girl who grew up to become "Toni Stone," the first woman to play for a professional baseball team. One day in the 1930s, Marcenia and the boys she plays ball with learn that Gabby Street, a famous baseball manager, is scouting children for a baseball summer camp sponsored by the St. Louis Cardinals. Eager to earn a spot, Marcenia plays her best, but is discouraged when Mr. Street tells her there are no girls in his camp. Convinced that baseball is her destiny, Marcenia won't give up, ultimately proving her skill and passion to Mr. Street and her dubious parents.