A beast with a grudge has come down from the mountain to terrorize the townsfolk of Porterville. The once sleepy town is suddenly wide awake. Sheriff Abel McGuire and game warden Grant Tanner frantically investigate one brutal slaying after another as they follow the blood trail they hope will eventually lead to the monstrous killer. But they better hurry and stop the carnage before the census taker has to come out and change the population sign on the edge of town to ZERO.