Sara Staley’s Reviews > Betrayal in Berlin: The True Story of the Cold War's Most Audacious Espionage Operation – George Blake, the CIA's Tunnel, and the KGB's Greatest Triumph > Status Update

“‘There, underground on the subterranean line dividing two systems and ideologies, some man with a well-developed sense of humor had placed a tiny roll of barbed wire and a piece of cardboard bearing the message, ‘You are entering the American sector,’’ he said. Wolf could not help smiling. ‘Here I was, one of the prime enemies of the CIA, sharing this private joke of American intelligence workers!’”