It's a novelization of a computer game, but it puts the fear of god into you in any case: Peter Watts has a talent for telling you exactly what you don't want to hear in ways that you can't help hearing.

Although I haven't played the game yet, I'm actually glad I read this first; this gives me far more of an idea of what it's supposed to look like from the perspective of someone jammed into a supersuit and told to be an unstoppable killing machine. Interesting way to point out that he doesn't really have a choice about it...