The Summoning by Kelley Armstrong

Chloe sees dead people. Now you know, even though you've seen The Sixth Sense a hundred times that "I see dead people" still SCARES THE CRAP OUT OF YOU. Chloe's sight lands her in Lyle House, a home for mentally ill teens where it quickly becomes apparent that she's not the only one whose condition is far from textbook. As Chloe and her housemates begin to discover their extraordinary similarities, they realize that it isn't coincidence that they all ended up in the same group home together. Lyle House holds a dark, unthinkable secret far more astonishing than their own conditions and the secret threatens their very lives.

This book could have been REALLY scary because the premise was absolutely terrifying. I think it's a testimony to just what a great writer Armstrong is that she was able to reign in and simply tell her story, minus the horror she could have written. How terrifying it must have been for Chloe, to have no one believe her, lock her away and make her question her own sanity. I can't even imagine what it must feel like to not be believed and to be abandoned and betrayed. Not to mention that she's seeing DEAD PEOPLE, which isn't exactly fun either.

Very quick read because I wasn't able to put it down once I started. By far the best cliff hanger ending I've read yet. I'm lucky to have discovered this book after the sequel had been published because I know that had I read it when it was released I would have gone crazy waiting for the next book.