Buckell, Tobias S. -- Crystal Rain

I kept hearing that Buckell was the new awesome. Turns out he is. A human colony is beset by war, an Aztec-model blood-hungry religion coming over the Wicked High Mountains. (That's what they're really called, and I pretty much bought the book right there.) We quickly run into hints of an alien invasion, centuries ago, which was blocked when the human starship captains intentionally fried most of the tech in the system, including the wormhole gate. The surviving Caribbean-paradise civilization is warped around the remaining aliens (playing gods) and the few old-timer humans whose nanotech is still ticking. The aliens are winning, but there might be a surviving starship... Good old-fashioned lost-starship chase plus land war with alien demon-gods. Read it.

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