After his release into "real life" (and on the receipt of considerable compensation from the accident), he gets the urge to re-enact memories and incidents that he viewed as "real." As the book develops, the re-enactment get weirder and weirder. At one stage, for example, he wants to see a cyclists murder re-enacted. On another occasion, he has a tyre change repeated again and again.
The book's weird. I didn't really get it. I couldn't see the point of it if I'm honest. It's well written, it's just I found it hard to believe (oh and the compensation was far too low).