Once dead, twice shy - Kim Harrison

My name is Madison Avery, and I'm here to tell you that there's more out there than you can see, hear, or touch. Because I'm there. Seeing it. Touching it. Living it.

Madison's prom was killer-literally. Now, thanks to a mysterious amulet, she's stuck on Earth: dead but not gone. She has no idea why the dark reaper who did her in was after her, but she's not about to just sit around and let fate take its course. With a little skilled light-bending, the help of a light reaper (one of the good guys . . . maybe), her cute crush, and oh yeah, her guardian angel, Madison's ready to take control of her own destiny once and for all, before it takes control of her.

Well, if she believed in that stuff.