Uglies - SCOTT WESTERFIELD.

This book lies about , the future along the lines of Shirley Jackson and Pearl S. Buck. In Tally's world, everyone gets an operation that makes them pretty when they're sixteen, when they leave their home at Uglyville and move to New Pretty Town with the other new pretties. They get wider eyes, healthier skin, fresh coloured lips. It's all according to the formula of asthetic attraction written in our genes by biology.

What could possibly be wrong with that?

But not everybody wants to have the operation. Sometimes, they run away, out into the ruins of the Rusties--the civilization that existed before, the one that chopped trees and burned oil and laid down steel and concrete, and tinkered with the natural order of things until finally it outsmarted itself and became the civilization that exists now: Uglies and Pretties.

Tally's new friend Shay is an ugly who doesn't want to have the operation. She sneaks Tally out at night and shows her the ruins of an old amusement park, and tells her of a friend she has met out there that takes runaway uglies to a hidden place, a place away from being pretty--a place known only as "The Smoke."