Among others - Jo Walton

'It doesn't matter. I have books, new books, and I can bear anything as long as there are books.'

Fifteen-year-old Morwenna lives in Wales with her twin sister and a mother who spins dark magic for ill. One day, Mori and her mother fight a powerful, magical battle that kills her sister and leaves Mori disabled. Devastated, Mori flees to her long-lost father in England. Adrift, outcast at boarding school, Mori retreats into the worlds she knows best: her magic and her books. She works a spell to meet kindred souls and continues to devour every fantasy and science fiction novel she can lay her hands on. But danger lurks... She knows her mother is looking for her and that when she finds her, there will be no escape.