A Beast Within follows Bill Draig, a network administrator with the Vasquez Corporation, who has just been promoted and is out celebrating with his friends. After a night of heavy drinking and bad decisions, Bill discovers that he has become the first person infected with the Vorcino Virus in twenty years. While running for his life he meets three people who will forever change his life. Erika Lorenz, a highly intelligent college student who is stripping her way through college. Vasille Fonentouix, the co-leader of a hidden group of “vampires” who wants to help Bill. Constantine Collins, a once brilliant scientist who has become a psychopath who is determined to free his people from the tyranny of the local populace. A mysterious and violent ancestry, a prophecy, and Constantine’s never ending war on humanity all converge in a final battle for the fate of the world.