Since the United States entered the war, eerie things have happened during Halloween. Several years in a row, out of nowhere, a haunted Stuart tank had appeared. In a blaze of fire and fury, flanked by pumpkin-headed soldiers, it had trundled straight into enemy lines and wreaked havoc on any terror-stricken soldiers it encountered. This time, German High Command hopes Father Leonhard, military chaplain and exorcist, will be able to send these demons back to the circle of hell they should never have left. He must celebrate a short mass in the sanctified chapel of Saint Gothard, near Cologne.