If you want a different kind of dystopia that has some of the same fast-paced immediacy that Hunger Games has...Susan Ee's Angelfall is good. The apocalypse here is that Angels have invaded Earth and basically brought it to ruin in a matter of days, enslaving the human race and making the world their own. It's about a girl named Penryn trying to find her little sister, who's been taken by Angels.
I liked the book a lot.
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