Kim Philby was a master of deception. Recruited by Soviet intelligence in Cambridge during the early 1930s, he was a cornerstone member of the famous Cambridge Five spy ring. During World War II, he managed to infiltrate MI6, later also gaining access to CIA circles in the United States. For more than 20 years, he provided the Soviet Union with crucial intelligence about the British and American secret services. In 1963, his cover was finally blown, and he fled to Moscow.