Legendary spy power couple Jonna and Tony Mendez met while working for the CIA in the Soviet Union, building the tools of espionage: the disguise kit, the camera that could hide anywhere, the cyanide pen. There they followed guidelines they called the "Moscow Rules" -- now the name of a new book they co-wrote before Tony's death. Jonna Mendez talks with Nick Schifrin about their work and mission.

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