I love those books!!! I've read them all! Ok so it's about this kid named Darren, and he goes to a circus with his friend. Somehow Darren becomes an apprentice for a real vampire that was part of this show, and he has to leave his home an never go back because he'd be a half vampire and he only ages like 1/5 as fast as humans. His master, Larten Crepsley, is an old vampire that has to teach Darren how to be a vampire while all this other stuff goes on while they live with the circus, Cirque du Freak. They're horror books, really gory and tense. I love them!!!!! you definitely need to read them if you haven't yet ;D and there's 12 I'm pretty sure, read them all!!!