This voice has shadowed Preston since the accident, protecting her from strife and unseen dangers. Now, it's ordering her to behave bizarrely: insisting she crashes the concert of a band she detests, accosts the drummer, and informs him that she is a turtle. 

Marked for immortality when she dies, Preston has become an unwitting pawn in a covert tug-of-war, unaware that two spirits - one good, one evil - are fighting for control of her soon-to-be indestructible body.