Ella on the Outside by Cath Howe

Ella is the new girl at school. She doesn't know anyone and she doesn't have any friends. And she has a terrible secret.Ella can't believe her luck when Lydia, the most popular girl in school, decides to be her new best friend - but what does Lydia really want? And what does it all have to do with Molly, the quiet, shy girl who won't talk to anyone?A gripping story of lies, friendship, and blackmail...