Wings of Sorrow — Iain Rob Wright

A captivating fantasy that brings the supernatural thrills of Buffy the Vampire Slayer and Angel to a new generation.
Growing up is hell.
Scarlet is a sixteen-year-old girl with no friends living with her single father. The one thing her life has none of is excitement. That's until she meets a naked stranger beside the lake. Then everything changes.
Scarlet discovers that she is not just an ordinary sixteen year old. In fact, the fate of the world rests on her shoulders, and it seems like she's one of the bad guys. A weapon.
Pretty soon, Scarlet is going to miss her old, boring life, but will have to accept that it is gone forever. At least she's made a friend -a demon named Sorrow. He's one of the bad guys too.
Only evil can save her now.