Eight months ago vampires released the Revenant Virus on humanity. Both species were nearly wiped out. For Mike Robson, the situation could be far worse. He's joined up with a small band of humans and the last coven of vampires who are riding out the zombie apocalypse in an old fort along the coast of southern Maine. The group's uneasy alliance is strained by the arrival of the creator of the Revenant Virus. He claims there is a vaccine that will make them immune to the virus, but it's located in a secure underground facility five hundred miles away. To retrieve the vaccine, Robson leads a raiding party of humans and vampires down the devastated East Coast. Yet none of the horrors Robson has faced match what awaits in the underground facility...