The most gripping non-fiction book I've read!
The first few chapters set the context of the main character slowly rising in tempo leading to a feverish pace towards the end. The last third of the book is unputdownable. This is the story of Oleg Gordievsky a KGB spy who became an MI6 double agent. As the most senior KGB agent to defect to MI6 during the cold war he probably averted a major war and possibly changed the course of the cold war itself by hastening the collapse of the Soviet Union.
While the book referred to real-life people including world leaders throughout I completed the book thinking this was good imagination merging fiction with the truth. It was only during the epilogue it struck me that I should Google the names, I was shocked to realise all of the characters were true and the book was non-fiction!
This book was more gripping than most fictional thrillers I've read! I suggest reading the book and then checking out Wikipedia so that the story isn't spoiled for you. Leave a comment if you enjoyed the book