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But Tally's new friend Shay isn't sure she wants to become a pretty. When Shay runs away, Tally learns about a whole new side of the pretty world-- and it isn't very pretty. The authorities offer Tally a choice: find her friend and turn her in, or never turn pretty at all. Tally's choice will change her world forever...
Uglies (Uglies #1) by Scott Westerfeld