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Dr Chris Smith has written a fascinating new book about John Cairncross, one of the famous five Cambridge spies who infiltrated high positions in the British intelligence service and reported back to Russia. Kim Philby, the most famous of the spies, was almost in charge of MI6 before his associate was detected, and intelligence officers grew suspicious. For ad free versions of our entire podcast archive and hundreds of hours of history documentaries, interviews and films, signup to History Hit TV. Use code 'pod3' at checkout. Producer: Peter Curry  

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