nameless: a novel (Nameless series)

Thea Mendel is living in her car because there's a ghost in her house. At a Halloween party, she meets someone who believes her, a boy with green eyes and ghosts of his own named Thomas. Someone wants to do worse to Thea than kill her, and in order to find out who they are and what they want the two of them will have to deal with a clan of unusually helpful vampires, unexpected Shoggoths, and all the weird that Rhode Island can throw at them. And that's a lot of weird.