The Graveyard Book by Neil Gaiman
A warning: this book is not for the faint of heart. In this Newberry award-winning book, Neil Gaiman tells the story of Bod, short for Nobody, who grows up in a graveyard, raised by ghosts. When Bod crawls out of his crib as a baby, his family is murdered by a strange man named "Jack." The ghosts of Bod's family beg the inhabitants of the graveyard to care for him, and so Bod grows up away from normal humans.
While a bit spooky, The Graveyard Book is definitely an interesting read. It comes with beautiful, sort of graphic novelesque illustrations by Dave McKean. This is a great book for young adults who are interested in something a bit different than the norm, and are not afraid of ghosts.