In the west, the habit does not always make a good sister. Some hide guns under their robes... Sister M. never leaves his religious clothes... and for reason, her dress with fabrics lined with iron plates is a real armor under which she hides revolvers. Sister M. is not one of those triggers of saloon, it is a killer, a true, an archangel that the Church sends down the big game to defend the interests of Christ to the wild West. From the Orc warlords to the powerful Elves hunters, she has cooled all her targets without ever failing. But her next sacred mission risks being the last. She must kill the Banquier: the richest and best protected man in the United States. A man who never leaves the train he lives on and where Christ has never been brought in. Then a good sister...