Uglies

In a world that is rapidly descending into chaos, Frey and Rafi are twin sisters, but few people know of Frey's existence, because she has been raised to be her sister's body double and lethal bodyguard, while Rafi has been raised to further the family's political power--but when their father sends Frey in her sister's place as collateral in a tricky deal, Col, the son of a rival leader, gets close enough to begin to suspect something, and Frey must decide whether to deal with him violently or finally assume her own identity.

Presents two novels in Scott Westerfeld's "Uglies" series, set in a futuristic society where, at age sixteen, everyone is given an operation that turns them into perfect supermodels, and one girl challenges the system.

Tally is faced with a difficult choice when her new friend Shay decides to risk life on the outside rather than submit to the forced operation that turns sixteen-year-old girls into gorgeous beauties, and realizes that there is a whole new side to the pretty world that she doesn't like.