The Graveyard Girl

Fifteen-year-old British ex-pat Sammi Keen spends most of her free time reading books in the graveyard behind her aunt's cottage and avoiding other kids. But when she comes home to find the cottage ransacked and her aunt missing, Sammi has to learn to trust some new friends, and her own newly discovered abilities, fast. Because time is running out for her aunt, and as she soon learns, maybe a few billion other people.