Here's everything you need to know about the inspiration behind A Spy Among Friends.
Is A Spy Among Friends based on a true story?
A Spy Among Friends is based on a true story about real-life spies Kim Philby and Nicholas Elliott.
Philby was a British intelligence officer who, in 1963, was revealed to be a member of the Cambridge Five spy ring, which had divulged British secrets to the Soviet Union for decades. After being uncovered, he flew to the Soviet Union where he remained until his death 25 years later.
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Meanwhile, Nicholas Elliott was an MI6 officer who had been good friends with Philby for decades when his betrayal was revealed. Elliott was tasked with attempting to secure Philby's confession after the intelligence service's suspicions were raised. You can watch a clip of Elliott interrogating Philby in A Spy Among Friends below.
In the series, Philby is played by Guy Pearce, who admitted in an exclusive interview with RadioTimes.com that while he had heard of Kim Philby and the Cambridge Five, he did not know about their history "in any detail".
He said: "Therefore [I] had a lot of work to do when I started this. I wasn't really aware of Nicholas Elliott. But I very quickly found myself intrigued.
"I suppose what's great about our show is that the question of friendship and the betrayal of friends is something we can all perhaps relate to, even if we haven't been betrayed.
"I think we certainly can imagine what it might feel like if we were betrayed by one of our friends, let alone a friend who we've known for 20-odd years, and let alone in such a public way that is also connected to so many bigger important elements within the society and the country that we live in."
Meanwhile, Damian Lewis told RadioTimes.com that he "didn't know anything about Nicholas Elliott" until he read the book, but that he found the "awfully tragic arc" compelling as it was such as "intimate betrayal".
Lewis also explained what it was about Nicholas that appealed to him as an actor: "Philby... is obviously the rock star. In this country in particular, Philby and the Cambridge Spies is quite well-trodden ground. Why make another programme about Philby, Burgess, McLean and Blunt? They're all familiar names. The one unfamiliar name is Nicholas Elliott.
"He became our sort of audience, our way in. I also thought that he was an interesting man to play — in some ways, structurally at least, he's our everyman."
Is A Spy Among Friends based on a book?
It is. A Spy Among Friends is an adaptation of the non-fiction book of the same name, which was written by Ben Macintyre.
Amongst many other non-fiction books he has written, Macintyre also wrote SAS: Rogue Heroes, on which Steven Knight's BBC war drama was based.
