I ended up reading Tinker Tailor Soldier Spy after you ripped Casino Royale a new one since Smiley appeared to be a reaction and antithesis to Ian Fleming's fantasies. A fat and ugly spy whose wife repeatedly cheats on him felt a bit too much on the nose. I did finish it, but I'd be lying if I said it wasn't a bore. I think the book kind of paints the picture of Britain as a country in decline that has been sidelined by their allies, or maybe I'm confusing it with only acknowledging being a "temporarily embarrassed empire" that will surely rise again. After finishing it I learned it was the first part of a trilogy. Yeah, no, I'm out.
My all-time favorite "spy" book is Eye of the Needle by Ken Follett. It is legitimately great writing and a debut novel to boot. Follett later wrote the Century Trilogy which I also found deeply engaging and enjoyable- it's a "gone with the wind" treatment of the 20th century through the perspectives of a British, a Russian and an American family. I suspect that everyone who loves Herman Wouk loves him because Follett had yet to write the Century Trilogy. Second and third place would be Day of the Jackal and Dogs of War by Frederick Forsythe. There was a time when friends of mine decided we were going to set ourselves up as despots in a small African nation. Chinese guns and ammo were cheap. We settled on a force of 1500 and overthrowing Togo. Six months later I discovered that Frédérick Forsythe had written a book about mercenaries overthrowing a small African nation for profit... And for research, set about with his buddies to overthrow the government of Togo.
Me and my brother used to take turns re-reading Day of the Jackal. Must have read it close to ten times. I don't know why I never checked the library for more books by Forsythe, the only other book by him in my parents bookcase was Codename Odessa. Dogs of War has been added to my library queue along with Eye of the Needle. Thanks!