In Lorraine, close to the border of Germany, the Chief Inspector Pierre Niemans is investigating the death of a man behind of a wall of an isolated abbey. Meanwhile, the efficient detective Reda is investigating the attempt of murder of a man called Jesus. They come to the same point along their investigations, join forces with the detective Marie, a specialist in religious matter, and fight against Heinrich von Garten, a German Minister of Culture and Religion, a group of powerful monks.