In this ground-breaking volume, Colonel John Hughes-Wilson charts the history of intelligence- from its biblical origins to the onset of the surveillance state in the digital age- and lifts the veil of secrecy off this clandestine and murky world. Comprehensive in its range, On Intelligence skillfully examines the dangerous uncertainties of spies and human intelligence; how the Cold War became an electronic intelligence war; the technical revolution that began with he use of reconnaissance photography in the First World War and during the Cuban Missile Crisis; how signals intelligence gave America one of its greatest victories; how Wikileaks really happened; and whether 9/11 could have been avoided if Americas post-Cold War intelligence agencies had adapted to the new world of international terrorism. From yesterdays spies to tomorrows cyber world, On Intelligence is a fascinating and thought-provoking insight into this ever-changing and ever-relevant subject.