This novel is best enjoyed if you know nothing about it and just read it cold. I was fortunate enough to have done just that, and got a lot more out of it, because the back blurb gives quite a bit of it away.Eye In The Sky is another expedition into PKD's favorite theme: "what is reality?" As such, the reader spends the first half of the book learning what the "game rules" are, and once the fun of that has played itself out, the back half is spent trying to figure out who the "game master" is -- which purposefully shifts several times. Because of this, there are two levels of enjoyment in the book.Normally, I'm a bit wary of PKD's early works, especially his short stories (which were written for pulp magazines with an obvious looming deadline and word limit.) Eye In The Sky surprised me at how well it was written (for someone still early in his career) and I believe it ranks up with the classics of his later days.