“A tour de force. . . . If one were to select only one book on the history of American intelligence, . . . Vigilance Is Not Enough should be it.”—Sarah-Jane Corke, Journal of Military History“An excellent and well-documented one-volume history. . . . Deserves a spot on the bookshelves of everyone who follows the subject.”—William D. Murray, Studies in Intelligence“Lowenthal’s style of writing . . . is pure pleasure [and] each paragraph is a surprise. . . . Should probably be required reading for every person interested in an intelligence career, and it will also be very useful for enemies of the United States. . . . The best history ever written on US intelligence. . . . A masterpiece.”—Edward M. Roche, Journal of Strategic Security“This readably artful masterwork embodies Lowenthal’s unique qualification—the ideal combination of professional historian and experienced practitioner—for interpreting the complex story of intelligence and foreign policy.”—Richard K. Betts, author of Enemies of Intelligence“This book is the authoritative account of why U.S. intelligence has the shape that it has, with a revealing account of its successes and an honest account of its failures.”—Sir David Omand, author of How Spies Think “Mark Lowenthal’s magisterial history of U.S. intelligence drives home what James Bond movies distort: intelligence is a service function, and all the spying and eavesdropping are means to the end of helping political leaders frame wiser policies. And as a sometime insider, he knows that whether intelligence matters depends very much on the proclivities of senior officials, especially the president, from George Washington, who ‘outspied’ the British in winning the Revolutionary War, to Donald Trump, who mostly ignored intelligence.”—Gregory F. Treverton, University of Southern California and former chair of the National Intelligence Council