Tom Dempsey, whilst seemingly no relative of World Heavyweight boxing champion Jack, was just as much of a scrapper as his namesake, although in Tom's case the gloves were off - permanently. In the 1940s, he ran a jumping joint called the Penny Baker Club, and as we enter the world of "The Blue Butterfly", we likewise cross the threshold of his establishment, and are whisked away, courtesy of Castle's vivid and virtual imagination, to a time and place of molls and dolls, of tough guys, wise guys and gumshoes.