A madman is on the loose in the city. Alone and on the verge of psychic collapse, detective Arnold Magnuson follows clues in murder's wake--through the Chicago of society clubs and nightclubs and the city of small-time hoods and big-time Mafia, the slums smelling of machine oil and riverside tanneries and pristine lakeside villages--through subtle interrogations, split-second lies, and improvised stories, moving ever closer to a culprit who begins...