From the back of the book:
Ten murders on the New York City subwary - all horrible, no two alike. The tabloids cry "Subway Psycho" and the cops search for a serial killer. But their both wrong - because what they're looking for isn't even human.
Only a handful of people know the truth about the creature stalking Manhattan's cavernous underground...a creature with an uncontrollable thirst for blood and domination.
worst of all, they know that his kind has ruled the night for centureis, and that down in the tunnels, the night lasts forever.