Not quite finished this history, but it is long. And really great. If you are interested in Hollywood in the forties, this is the one to read. It begins with the influx of talent (composers, directors, actors) flooding into the country following Hitler's aggression in Europe in '39 and follows the story up to the Cold War, the McCarthy Hearings, etc.
It is not a celebrity gossip book although there are lots of juicy stories in it. It details the union struggles, the writers who came seeking a paycheck they could count on (Faulkner, Dreiser, Hemingway, etc) the composers whose talent was extremely misunderstood by the studios, how the war affected both the content and cast of Hollywood, the goofiness of many of the studio chiefs in handling and mishandling talent.
City of Nets is the work of a gifted historian and writer. Highly recommended