Abandon by Meg Cabot
Last year, Pierce died - just for a moment. And when she was in the space between life and death, she met John: tall dark and terrifying, it's his job to usher souls from one realm to the next.
There's a fierce attraction between them, but Pierce knows that if she allows herself to fall for John she will be doomed to a life of shadows and loneliness in the underworld. But now things are getting dangerous for her, and her only hope is to do exactly what John says . . .