Try 'This Is Not A Game' by Walter Jon Williams. It's a sort of cyber-thriller, set in the very near future, in which the boundaries between a game and reality become very blurred indeed.

The remarkable thing about Williams is that all of his books are different and you never know what he's going to write next. He's definitely one of the best writers working in the SF/Fantasy field today and one of my favourite writers of all time - he definitely deserves to be better known.