My Soul to Lose by Rachel Vincent
Everyone I know seemed to be reading this short story. I had it on my Kindle, so I gave it a try. I really liked the story, but it leaves you wanting more. Since I assume this is a teaser for a new series, I'm sure that was the intention, but I would have preferred a story that had a definite end. Kaylee sees shadows around people who are going to die soon. This causes her to have panic, screaming attacks that causes her to wind up in a mental facility. There seem to be some other patients there that understand her problem, but of course none of the adults do.