Nathaniel Cade is the President's vampire - sworn by a blood oath to protect the President and America from their supernatural enemies. Helped by his partner, political liaison officer Zach Barrows, Cade is looking for the source of a deadly new virus that is being used to attack armies across the world - a virus that transforms its victims into vicious animals in seconds and spreads in minutes. And that a powerful group called the Shadow Company are determined to release among the general public...