Underworld by Kris Oprisko & Danny McBride

Underneath the city streets, amid the labyrinth of subway tunnels and gothic ruins, the most notorious creatures of the night collide in an all-out war. It is the culmination of the bloodthirsty battle between two mortal enemies...the Vampires and the Werewolves. Also included in this book is a special prequel story, set hundreds of years before the epic movie, written by one of the movie's screenwriters, Danny McBride, with Kris Oprisko, who scripted the adaptation.