This was a re-read for me, actually--I read it the first time when I was 19, and I still love it just as much.
ANYONE who's ever been jilted and ill-used by a lover/spouse/partner and fantasized about getting the ultimate revenge, this book tells the (fictional, of course) story of one woman who actually goes for it.
Some of her actions are cringe-worthy...she steps over a lot of lines, and makes unthinkable sacrifices. Many of the things she does would be impossible in today's tech-savvy world, where every action can be traced by some record. But her story (which toggles between first-person and third-person narrative) offers an interesting perspective on the struggle between nature and human will, as well as showing us the possible advantages of being among society's "invisibles," those who just don't fit in, and whom "the beautiful people" would rather forget exist--if they dare!