When the Gordon Family open their door to a stray Elkhound, they unwittingly welcome in the forces of evil. For, according to the local priest, the huge dog is Satan himself, fulfilling an ancient prophecy. But, no one will believe this warning... Even when sheep - and wolves - are mysteriously slaughtered. Even when frenzied pets turn on their owners. Even when Emily Forrest is savagely eaten alive - the first of many human victims. As winter tightens...