Rudy Giuliani was hailed after 9/11 as "America's Mayor," a national hero who, at the time, was more widely admired than the pope. He was brilliant, accomplished--and complicated. He conflated politics with morality, made reckless personal choices, and engaged in self-destructive behavior. A series of disastrous decisions and cynical compromises, coupled with his need for power, money, and attention gradually ruined his reputation, cost him political...