This is the story of Oleg Gordievsky, one of the West's most valuable Cold War agents who risked everything to avert a third World War. Appearing to be an ambitious diplomat stationed at the Soviet embassy in Denmark. Gordievsky was actually a Russian spy and a rising star of the KGB. After a few years in Copenhagen, he was recruited by the British and posted to London by the KGB. Whilst in London, President Reagan authorised the largest NATO war game in its history: Able Archer.From the KGB's station in London, Gordievsky passed key intelligence to the British which many believe singlehandedly pulled the world back from the brink of nuclear annihilation before being summoned by the KGB to return to the USSR immediately. Uncertain if his cover had been blown, Gordievsky was accused of being an MI6 spy. Refusing to blow his cover, he set in motion his MI6 extraction plan, leaving behind his wife and children. It would take 6 years and the collapse of the Soviet Union before his family could flee Moscow to join him. In 2007, Gordievsky was appointed ‘Companion of the Most Distinguished Order' for services to the security of the United Kingdom by the Queen.