TH3 D3MON, by Sean M. Thompson.
It's a story about a computer virus that may (or may not) have infernal origins and causes people to commit disgusting crimes, perform ritual murders, practice cannibalism, and enjoy other such adventures once they have seen the red screen of death. It is very possible, even probable, that the author is satirizing some or all segments of society in the process, in the most sincerely Romero-ish sense.
The characters are very well-realized and the incidents are generally not gloated over, occurring in fugue states, keeping the book from being splatter and adding to the mysterioso air of the book.
Great fun.
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