Neuromancer by William Gibson

Case was the sharpest data thief in the matrix—until he crossed the wrong people and they crippled his nervous system, banishing him from cyberspace. Now a mysterious new employer has recruited him for a last-chance run at an unthinkably powerful artificial intelligence. With a dead man riding shotgun and Molly, a mirror-eyed street samurai, to watch his back, Case is ready for the adventure that upped the ante on an entire genre of fiction.