Torn / Cat Clarke.

Alice is an ordinary girl dealing with the ordinary world of school: friendships, rivalries, jealousies, hierarchies, bitchiness and fun. Nothing unusual, nothing strange. When her school brings the girls on a trip to an outdoor adventure centre in Scotland, Alice and her friend Cass are stuck sharing a room with Tara, the queen of mean who rules the school, Polly, the borderline social outcast, and Rae, the moody emo. Beautiful, powerful and cruel, Tara enjoys nothing more than putting people down. When Polly is involved in a humiliating accident, Tara and her mates to their best to make her look as silly as possible. Cass decides that it's time Tara was taught a lesson and so begins a series of events that will change the lives of these ordinary schoolgirls forever. Returning to London without Tara, the four girls carry a terrible secret they have sworn to keep. But the burden of such secrecy is a lot to bear, and events soon begin to spiral out of control, especially when Alice gets involved with Jack, Tara's gorgeous, grief-stricken brother...A powerful thriller that uncovers a terrible darkness behind the facade of schoolgirl innocence, Cat Clarke is a uniquely compelling new voice in YA fiction.