France, 1916. Europe is riven by two years of mechanised slaughter in the Great War. Hundreds of miles of muddy trenches and chemically-polluted wasteland run from the North Sea to Switzerland. Here at the southern border, so-called Kilometre Zero is quiet. The enlisted men are too cold and tired to pursue valour, the officers too wary of upsetting their neutral Swiss neighbours. Both French and German forces are content to huddle by their fires and let their comrades fight it out further up the line.But something is upsetting the silent, snowy peace of Kilometre Zero. Livestock are found mutilated, a night patrol suffers a grisly encounter, and a captured German deserter carries a dire warning. As the full moon rises above the Jura Mountains, American legionnaire Sam Carter and British officer Lucas Avery once again find themselves drawn into battle with a supernatural evil...