Tunnels of Blood, Book 3, takes Darren on a new adventure, as he, Mr. Crepsley, and Evra the snake-boy leave the Cirque for the city. We're introduced to another kind of vampire — the vampaneze — a being that kills indiscriminately for human blood, turns an odd color from gluttonous imbibing, and hates vampires. We also learn about the history of vampires, their political hierarchy (yes, there is one — it even includes Vampire Generals and a mysterious central headquarters which we visit in the next book), and their system of laws and punishment. Darren enjoys a small romance in Tunnels of Blood, which he must abandon for further adventures. This, the third book, loses some of the momentum of the first two, as Darren tracks the elusive and highly dangerous vampaneze while hesitantly pursuing his crush, but it will keep most readers engrossed.