Samhain - Book One of the Venatores by Pam Sommerville

Sam’s having a rough night, but almost being eaten alive will do that to anyone. That thing just came out of nowhere. Nothing should be able to move like that, to keep coming like it did after the guy showed up on its tail and put that many bullets in it. Put himself between it and Sam. Turns out the things in Sam’s nightmares aren’t just alive and well, but they have a serious bone to pick with her. Apparently so does the guy that just saved her life.