A fascinating look at spies and espionage of the 20th century: the Zimmerman note in World War I, Pearl Harbor's impact on U.S. intelligence planning, the role of the OSS in World War II, atomic spies and American moles in Washington, McCarthy and the professional anti-Communists, the Falcon and the Snowman and John Walker and his spy ring, intelligence in the Gulf War, Robert Hanssen and Wen Ho Lee, and intelligence in the War on Terror.