Forever 16.

Sixteen-year old Raven Highgate is not your average teenager, she is a vampire and this is her umpteenth time attending a new high school to keep her identity hidden. But when a local cop reveals she knows Raven's secret and offers to introduce Raven to others of her kind in exchange for help catching a murderer loose in the school, Raven has no choice but to accept. . .but at what cost?