Mortal Terror (Mortal Terror #4)

Series finale! A vampire-flipped Dracula in which mortality means life... and life means death. Vampires Jonathan Harker, Lucy Westenra, and Mina Murray live in underground London, trying to keep the undead city safe from the rumored mortals above who seek to give them life, only to kill them. A risky trip to London above forces the vampires back underground for safety, but time is running out after one of their own is captured and taken to Dracula's castle.