"Indiana, 1933". During the Great Depression, various bank robbers and other outlaws have become folk heroes due to public distrust of financial institutions and the law. Following the Kansas City Massacre in June 1933 in which several law enforcement offers were killed brazenly in broad daylight, FBI field office chief Melvin Purvis decides to personally hunt down the men he deems responsible: Charles Arthur "Pretty Boy" Floyd, Lester "Baby Face" Nelson, George "Machine Gun" Kelly, "Handsome" Jack Klutas, Wilbur Underhill and John Dillinger. During a meeting with fellow FBI agent Samuel Cowley, Purvis makes it clear he seeks personal vengeance and that he's willing to use extralegal measures if necessary.