It's about a girl who saves a teenage boy from a bunch of crazy adults who thinks he is a vampire. Later, turns out they were right, but they kidnapped who little brother because their boss thinks she's a vampire. She goes along with him to try to save her brother, and of course, falls for him along the way. I have no idea who the author is or what the title is. This is the only chance that I have to find that book. Please help!