The Summoning by Kelly Armstrong

For Cloe Saunders normal takes on a new meaning the day she starts seeing ghosts...and they see her. After a dramatic day at school, Cloe finds herself locked up in Lyle House, a special home for "unstable" teenagers, where she find that the students there are a lot more than just troubled. Lyle House is not what it appears to be, and Cloe is determined to find out whats really going on. Luckily there are plenty of ghosts to help her...

Senica: Necromancers have always held my interest so I was happy to read this book. The mystery of Lyle House kept me reading, as Cloe struggles to hold on to her thirst for being normal.