The Vampire's Assistant
And Other Tales from the Cirque du Freak
This book might be part of the Cirque du Freak #1-3 series.
by Darren Shan
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.