It is 1944. A platoon of German soldiers battle -weary and torn by tension and dissent take refuge from advancing Allied forces within the confines of an underground bunker system. As night closes in, a series of increasingly bizarre and horrifying events begin, leading ultimately to a deadly cat-and-mouse game of psychological warfare in a maze of tunnels. Are the soldiers being stalked by enemy soldiers, or have the demons from their past finally caught up with them...