Cirque du Freak #3: Tunnels of Blood by Darren Shan
Darren and Evra, the snake boy, leave the Cirque and follow Mr. Crepsley on a mysterious mission. While the boys enjoy the city, Mr. Crepsley spends night after night on the town, however, when six bodies are found in an abandoned building with their blood drained out of them, Darren has to find and kill the monster, even if the monster is Crepsley.
The third book of Cirque du Freak is fast paced and easily devoured with a suspenseful climax that had me questioning Darren's motives. Will Darren ever see his love interest again? And seriously, while he's in the city, can't he get rid of that pirate costume?