The first book ever written on the National Security Agency from the New York Times bestselling author of Body of Secrets and The Shadow Factory.

In this groundbreaking, award-winning book, James Bamford traces the NSA’s origins, details its inner workings, and explores its far-flung operations. He describes the city of fifty thousand people and nearly twenty buildings that is the Fort Meade headquarters of the NSA—where there are close to a dozen underground acres of computers, where a significant part of the world’s communications are monitored, and where reports from a number of super-sophisticated satellite eavesdropping systems are analyzed. He also gives a detailed account of NSA’s complex network of listening posts—both in the United States and throughout much of the rest of the world. When a Soviet general picks up his car telephone to call headquarters, when a New York businessman wires his branch in London, when a Chinese trade official makes an overseas call, when the British Admiralty urgently wants to know the plans and movements of Argentina’s fleet in the South Atlantic—all of these messages become NSA targets. James Bamford’s illuminating book reveals how NSA’s mission of Signals Intelligence (SIGINT) has made the human espionage agent almost a romantic figure of the past.

Winner Best Investigative Book of the Year Award from Investigative Reporters & Editors

“The Puzzle Palace has the feel of an artifact, the darkly revealing kind. Though published during the Reagan years, the book is coolly subversive and powerfully prescient.”—The New Yorker

“Mr. Bamford has emerged with everything except the combination to the director’s safe.”—The New York Times Book Review