Originally Posted by MSWallack
Though a bit dated now, Trevanian had several excellent espionage stories (The Eiger Sanction, The Loo Sanction, and Shibumi).
Oh, I forgot Trevanian. Now there's a great underestimated writer. I've read all of those and Shibumi and The Eiger Sanction really stand out. (Don't blame Trevanian for the Eiger Sanction movie, heh)