Through most of the Roaring '20s, Jack Dempsey was the heavyweight champion of the world. With his fierce good looks and matchless dedication to the kill, he was a fighter perfectly suited to his time.In A Flame of Pure Fire, renowned sports writer Roger Kahn not only chronicles the thrilling, brutal bouts of the Manassa Mauler, but also illustrates how the tumultuous 1920s shaped Dempsey - and how the champ, in turn, left an indelible mark on sports and American history.