You can win both Possession and Evil Within at http://trishasbookshelf.blogspot.com/2010/06/author-interview-giveaway.html
Possession-Lindsay is hoping for a fresh start, to get out of San Diego, where everyone remembers when she had her breakdown, and get away to boarding school, even if it is a boarding school as creepy as Marlwood Academy. But Lindsay is happier, and even manages to make a great new friend, Julie. Then, the school's most popular girl, Mandy starts acting super creepy. Rumors abound, but it's becoming more and more clear to Lindsay that something else is at work...something darker and more dangerous than just a houseful of mean girls.
Evil Within-Evil is a lot harder to fight when it comes from within
In this sequel to New York Times bestselling author Nancy Holder’s Possessions, Lindsay finds out that she, too, is possessed, and must return to creepy Marlwood Academy in order to rid herself of the spirit. Lindsay’s afraid of what the spirit is telling her to do—kill Mandy! But the secrets of Marlwood go much deeper than Lindsay thought. Sometimes the girls who seem like enemies are actually on your side. And the voices you trust the most—the voices that come from within—are the ones that want you dead.