I have a soft spot for spy novels. While the current flavor is Nordic crime novels (the Millennium trilogy, Henning Mankell, et al), I still remember the first time I read The Spy Who Came in From the Cold. The terse prose, the elevation of human deception to the level of a high stakes game, it's all good fun.
The original Tinker, Tailor, Soldier Spy starring Alec Guinness is brilliant, too. Like a thick grey, somber wool blanket to wrap oneself in on a cold, autumn night.