[Strangelet]

I usually say that ender's game is not just one of my favorite sci fi books, but one of my favorite books in general. The rest of the series I found also good but much more sci fi-ish and not exactly the cross over ability as the first. Having the same religious back ground as the author adds to the experience, especially since he tends to incorporate the mormon myths into his story lines and characters. (which is why the books can veer off into the surreal side )