Chicago, 1946. Gambling chief James Ragen is shot right before the eyes of the man hired to protect him: A-1 Detective Agency's Nate Heller. Which mob boss hungry for Ragen's gambling action has made a fool of Heller: cold-blooded Capone heir Jake "Greasy Thumb" Guzik or hotheaded, movie star-handsome Bugsy Siegel? The answer's not in the mean streets of Chicago, because the city's mob wars have moved west, to the glitz of Hollywood and the fabulous - and illicit - potential of a shabby little desert way station they call Las Vegas...