Sometimes mystery master Donald E. Westlake is the author of uproarious crime capers. Sometimes he has a mean streak-and its name is Parker. From his noir classic The Man with the Getaway Face to his recent novel Nobody Runs Forever , whenever Westlake writes as Stark, he lets Parker run loose-a ruthless criminal in a world of vulnerable "straights." On a sunny October afternoon a man is running up a hill. He's not dressed for running. Below him are...