For something that's supposed to be secret, there is a lot of intelligence history. Every time I read one book, two more are published.
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About Alan Furst
Alan Furst was a contemporary American historical spy novelist. Alan Furst is an American author of historical spy novels. Furst has been called "an heir to the tradition of Eric Ambler and Graham Greene," whom he cites along with Joseph Roth and Arthur Koestler as important influences. Read more on Wikipedia →