I've just finished reading two books about actual spies by the same author: Ben Macintyre. One was about Kim Philby (obvs!) and I enjoyed it but the other I found utterly gripping. It's called The Spy and the Traitor and is about Oleg Gordievsky, a colonel in the KGB who ended up spying for MI6 until he was betrayed, and he was spirited out of the USSR in the kind of operation which had Hollywood written all over it. How they succeeded I don't know but they did, and Gordievsky is still alive, living somewhere in the UK under an assumed name (and with a 24 hour armed guard since the Skripal poisonings).