1914. The outbreak of war. In the French city of Arras, a Father is brutally murdered. The Catholic Inquisition sends its most determined of Inquisitors, Poldek Tacit, to investigate. Yet as Tacit arrives, armed forces confront each other across No Man's Land. As he strives in vain to establish the truth behind the murder, a beautiful woman, Sandrine, warns British soldier Henry Frost of a mutual foe even more terrible lurking beneath the killing fields…