Girl of Nightmares

People are disappearing. I see things no one else can. There is a secret society in the town. I have nightmares all the time, haunted by my twin. Hi, I'm Hayley Jekyll, you know, just your normal 300 year old vampire that goes to school at New York Private High. And Yes, Jekyll as in Dr Jekyll's daughter. I black out in hallways, see invisible people and my friends think i'm delusional. But then again, we aren't normal. With The Florence loose, we're screwed.
Hayley thinks she knows her family
She's Wrong
Hayley can only trust Daniel, Alexander and Lissa
Wrong Again
She thinks Florence killed her classmates
Wrong.
But the one thing she's right about, is the fact that she isn't normal.
And that this isn't your normal YA story.