Girlhood / Cat Clarke.

Harper has tried to forget the past and fit in at expensive boarding school Duncraggan Academy. Her new group of friends are tight; the kind of girls who Harper knows have her back. But Harper can't escape the guilt of her twin sister's Jenna's death, and her own part in it - and she knows no-one else will ever really understand. But new girl Kirsty seems to get Harper in ways she never expected. She has lost a sister too. Harper finally feels secure. She finally feels loved. As if she can grow beyond the person she was when Jenna died. Then Kirsty's behaviour becomes more erratic. Why is her life a perfect mirror of Harper's? And why is she so obsessed with Harper's lost sister? Soon, Harper's closeness with Kirsty begins to threaten her other relationships, and her own sense of identity.