Tally lives in a world where your sixteenth birthday brings aesthetic perfection: an operation which erases all your flaws, transforming you from an 'Ugly' into a 'Pretty'. She is on the eve of this important event, and cannot wait for her life to change. As well as guaranteeing supermodel looks, life as a Pretty seems to revolve around having a good time. But then she meets Shay, who is also fifteen - but with a very different outlook on life. Shay isn't sure she wants to be Pretty and plans to escape to a community in the forest - the Rusty Ruins - where Uglies go to escape ' turning'. Tally won't be persuaded to join her, as this would involve sacrificing everything she's ever wanted for a lot of uncertainty. When she is taken in for questioning on her birthday, however, Tally gets sent to the Ruins anyway - against her will. The authorities offer Tally the worst choice she could ever imagine: find her friend Shay and turn her in, or never turn Pretty at all. What she discovers in the Ruins reveals that there is nothing 'pretty' about the transformations . . . And the choice Tally makes will change her world forever.