Guardian of the Dead by Karen Healey
From Goodreads: In less than a day I had been harassed, enchanted, shouted at, cried on, and clawed. I’d been cold, scared, dirty, exhausted, hungry, and miserable. And up until now, I’d been mildly impressed with my ability to cope.
At her boarding school in New Zealand, Ellie Spencer is like any ordinary teen: she hangs out with her best friend, Kevin; obsesses over her crush on a mysterious boy; and her biggest worry is her paper deadline. Then everything changes: In the foggy woods near the school, something ancient and deadly is waiting. Karen Healey introduces a savvy and spirited heroine with a strong, fresh voice. Full of deliciously creepy details, this adventure is a deftly crafted story of Māori mythology, romance, betrayal, and war.
I'm really liking the sound of this. It's published April 2010