The walls have ears

You get the idea of the book pretty quickly, but despite the great detail the author goes into, the human stories and personalities are tremendous. Captured entirely from documents declassified 50+ years after the events in question and told in a masterful patchwork quilt of overheard conversations and ruses, it really gives one an appreciation for the type of work carried out in secret by governments around the world under the auspices of national security (though, in this case, largely above board, by current standards, and with much more consideration given to those under interrogation).