There's more to Aria than meets the eye. She's a guardian angel. And to earn her wings, she'll have to help three different girls. . . . This time, Aria comes to Caroline Mason. At her all-girls' prep school, Caroline is being bullied. She eats lunch alone and is picked on by her classmates every day. The ringleader of the mean girls is Lily Pierce. But Lily isn't an ordinary bully: she used to be Caroline's best friend. When Aria arrives, she can see Caroline is suffering. But, to Aria's surprise, so is Lily. What is the story behind Lily's cruel actions? And can Aria help guide Caroline out of the darkness . . . and into better, brighter future?