I recommend this to Rider Strong on an episode of WSIRN. This is a real life thriller about Kim Philby, the high level British spy who turned out to be a double agent for the Russians. It reads like a story, and it's almost too good to not be invented in a novelist's mind.

Russian agent Oleg Gordievsky came from KGB parents and attended the best Soviet institutions in the country, but he turned against his country and became a double agent. Partnering with British intelligence, Gordievsky exposed agents, disrupted plots, and helped the West against the KBG for a decade. Macintyre's account of his exploits covers everything from tensions and gamesmanship between MI6 and the CIA to a harrowing escape from a Moscow. For fans of The Americans TV show or The Secrets We Kept by Laura Prescott.