When NSA engineer Charles Gandy filed for a visa to visit Moscow in the 1970s, the Russian Foreign Ministry asserted with confidence that he was a spy. Outsmarting honey traps and encroaching deep enough into enemy territory to perform complicated technical investigations, Gandy nonetheless accomplished his mission in Russia, but discovered more than the CIA wanted him to know. Former NSA Director of Research Eric Haseltine tells of a time when—much like today—Russian spycraft had proven itself far beyond the best technology the U.S. had to offer. Haseltine uncovers the true story of intelligence officers who fought an uphill battle against their own government to prove that the KGB had pulled off the most devastating penetration of U.S. national security in history.