Tally's perfect life as a Pretty is disrupted when she receives a letter from herself, written when she was an Ugly, reminding her of the promise she made to take a drug developed to cure the brain lesions that keep the Pretties shallow and happy--and when she takes the pills, she becomes a target of those determined to keep Pretty society carefree.

"Frey has spent her life in a family of deceivers, a stand-in for her sister, manipulated at her father's command. Free from them at last, she is finding her own voice -- and using it to question everything her family stood for. Tally was once the most famous rebel in the world. But for over a decade, she's kept to the shadows, allowing her myth to grow even as she receded. Now she sees that the revolution she led has not created a stable world. Freedom,...