The United States is losing the counterintelligence war. Foreign intelligence services, particularly those of China, Russia, and Cuba, are recruiting spies in our midst and stealing our secrets and cutting-edge technologies. In To Catch a Spy: The Art of Counterintelligence, James M. Olson, former chief of CIA counterintelligence, offers a wake-up call for the American public and also a guide for how our country can do a better job of protecting its...