Paranoia - Joseph Finder

Adam Cassidy is twenty-six and a low-level employee who hates his job at a high-tech corporation. When he manipulates the system to do something nice for a friend, he finds himself charged with a federal crime. Corporate Security gives him a choice: prison - or become a spy in the headquarters of their chief competitor. It's no choice at all.

Adam is trained for his 'mission' and fed inside information when he lands a top job with the rival company. But then he finds that he has talents he never knew he possessed. He's rich, drives a Porsche, lives in a fabulous apartment, and is dating the girl of his dreams.

All he has to do is betray everyone he cares about and everything he believes in...