This is an amazing hook for the series, it is an extremely short Novella that leads you into book 1.  Right now Amazon Kindle even has a special where you can get this along with the first 2 books in the series at an amazing price.  :)  We start off with Kaylee going to the mall with her best friend and then having a "panic attack" which happens when she sees shadows and knows someone near her is going to die.  The "attacks" cause her to scream the loudest most insane horrifying scream imaginable.  This lands her in a psych ward for teens.