The killer cannot be seen or heard, but it can suck all the light and warmth from a room, select its victim in the darkness, and leave a bloodless, mutilated corpse night after night. The two German officers despise each other. One is a Nazi; the other hates everything the Nazis stand for. But they do agree on one thing -- outside help must be sought. An expert of local history and folklore, along with his daughter is summoned to the keep. The irony is that they are Jews. Another man has been summoned to travel across Europe to meet his destiny -- to attempt to destroy an ancient evil released from five centuries of solitude.