It's been one year since a comet hit Earth and blotted out the sun. Now, the world is a dark, cold landscape ruled by vampires. In the British countryside, a band of survivors has formed a resistance in the fallout shelter of a medieval castle. Among them is Darcy, a young, headstrong fighter waiting for the chance to prove she can be on the front lines. But when that opportunity comes, Darcy will come face to face with the true horrors of this new world.