His job was to protect NATO’s secrets but he ended up selling them to the Kremlin. This is the astonishing account of how Herman Simm, a former soviet militia officer, rose to become amongst the few safeguarding NATO’s military secrets. How, for over 13 years, he passed those confidential documents over to the Russians, jeopardising the West’s security and provoking the largest counter-intelligence operation in NATO’s history. The inside story of Russia’s highest ranking spy in NATO.