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All of Ben's books are amazing. Check Agent ZigZag out. I've read it like 4 times. Such an amazing fun story. http://www.amazon.com/Agent-Zigzag-Story-Espionage-Betrayal-...

Zig Zag was good, but if just starting with Ben Macintyre, I'd start with the Philby book. It's the better of the two. I've read both.

Thanks for the recommendation. Just bought it. At first I though it was fiction, but it is a true story.

His autobiography ("My Silent War") is worth reading - the process for getting into the intelligence services seemed pretty cursory - seemed to be pretty much lunch at a club to make sure he seemed like a decent chap...

Whilst we are compiling a bibliography, I'll add another suggestion: the excellent fictionalization of the Cambridge spies by John Banville, The Untouchable