It took me seven years to track down General Ion Mihai Pacepa, the former chief of Romanian Intelligence, after he defected to the United States in the late 1970s. He was the highest-ranking Soviet bloc intelligence officer to come to the West, and his defection produced the total dismantling of the Romanian service, as well as the identification of a considerable number of KGB “sleepers,” intelligence agents operating without official cover or diplomatic immunity. He has lived in secret ever since, as befits a man who is the object of two death sentences that remain in effect.