"Power Broker" is a biography written by Robert A. Caro that focuses on the life of Robert Moses, a powerful urban planner in New York City. The book details how Moses shaped the city's infrastructure, including parks, bridges, and highways, often prioritizing his vision over community needs. Caro explores the political maneuvering and influence that allowed Moses to maintain control for decades, despite public opposition. The book highlights the complexities of power, urban development, and the impact of one individual's decisions on the lives of many, making it a critical examination of American politics and planning.