A fascinating story about how the MI6 recruited a top-level KGB officer, with an in-depth look at his motivation to send information
to the British Secret Service.
Besides being a fascinating spy thriller that is not fiction, this book by Ben MacIntyre also shows how Information from this
one person helped avoid a major escalation in the Cold War -- few people can claim to have changed the way of the world mostly
by themselves. Oleg Gordievsky can.
Well worth the time, both for the story and the political / historical background and insights.