After traveling with Mr. Crepsley, the vampire who made him into a half-vampire, Darren returns to the freak show known as the Cirque du Freak and continues to fight his need to drink human blood.
The Vampire's Assistant

Darren Shan: The Vampire's Assistant (EBook, 2007, Little, Brown Books for Young Readers)
electronic resource
English language
Published 2007 by Little, Brown Books for Young Readers.