THE FOURTH MAN: The Hunt for a KGB Spy at the Top of the CIA and the Rise of Putin's Russia

In this work Baer tells the gripping story of one of the Cold War's greatest unsolved mysteries. In the wake of the Ames arrest, the CIA launched an investigation to make sure there wasn't another double agent in its ranks. Led by three of the CIA's best spy hunters, women who devoted their lives to counterintelligence, its existence was known only to a few.