Taking office as mayor of New York City, Rudy Giuliani aggressively takes on the city's major crime problems and huge budget deficit.

Responding to the tragedy of Sept. 11, Mayor Giuliani is in his finest hour; from there, it's a slow descent to irrelevance by way of a failed 2008 presidential campaign.

In Giuliani's final chapter, he finds himself the closest he's ever been to the White House as Donald Trump takes office; without the guardrails his friends and loved ones provided in the past, Giuliani becomes a darker influence than ever before.