It is part of the Vampire War trilogy, which comprises three books: Hunters of the Dusk, Allies of the Night and Killers of the Dawn.
He has trouble with most of his subjects as he only has a middle school education, but luckily his English teacher is Debbie, his old girlfriend from his first visit to this city.
Mr. Crepsley has to go back to Vampire Mountain again for Paris Skyle's funeral, leaving Darren and Harkat to continue the investigations alone.
One night on his way back to the hotel room the three are staying in, Darren encounters a Vampaneze with hooks for hands and a mask wrapped around his face.
Darren and Vancha take a Vampet and Steve as their hostage and are given a warning by Gannen to leave the tunnels immediately or he'll send Vampaneze to finish them off.