Shadowland (Mediator Series #1)

Meg Cabot is the New York Times best-selling author of The Princess Diaries series. Susannah Simon is a teenager who can see ghosts. As a bridge between the living and the dead, she gets called on to help ghosts take care of unfinished business. After she and her mother move from New York City to sunny California, Suze meets the sexiest boy she's ever seen -too bad he's a ghost, too.