Siena - Helen Eve

Worshipped, envied, desired, and feared by all, Siena Hamilton reigns over Temperley High. Nothing can shake her place as the head of Temperley's elite - not even that unfortunate incident at the end of last term . . . Siena is her mother's daughter: she knows how to be perfect, and she will not disappoint. There is only one person who could possibly get in her way...

Romy, former Starlet, and Siena's ex-best friend is back.
And no one is happy about it, least of all her.
Romy has changed after her term away in France, and is trying hard to be normal, to blend in and to keep the secret of what really happened that night safe and hidden.
But when you've betrayed your former best friend, you don't get to come back without a fight . . .

In this prequel to Helen Eve's first novel Stella, revenge runs deep, old wounds break open, and the past can never, ever be outrun.