"Big" Jim Stevens, undisputed boss of the Chicago underworld, gets an unexpected birthday present from his ambitious lieutenant, Guy Gisborne. Instead of a stripper popping out of the cake, Big Jim gets shot by all the guests. With the mob boss out of the way, Gisborne takes over. He orders all the other gangsters in town to pay him protection money, but declares it's still "All for One." The news does not sit well with Big Jim's fellow gangster, Robbo, and a gangland war breaks out.