During the early and most dangerous years of the cold war, a handful of Americans, led by President Dwight D. Eisenhower, revolutionized spying and warfare. In great secrecy and beyond the prying eyes of Congress and the press, they built exotic new machines that opened up the Soviet Union to surveillance and protected the United States from surprise nuclear attack. Secret Empire is the dramatic story of these men and their inventions, told in full for the first time.