Mortal Terror (Mortal Terror #3)

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. The team makes an expedition above-ground to investigate an attack from the mortals, but there may already be a mortal infiltrating their undead city below!