At the end of the earth, where mountains are flung peak upon peak as if they were discards of the Creator, piled together chaotically, the Salween River carves its way through granite masses making a canyon thousands of feet deep. For unknown centuries the Lisu tribes people have plowed these perpendicular hillsides into cornfields and reaped a bare, rough living. This is the true story of Mary, a young Lisu tribeswoman. See God transform her from a common stone into a rare gem, a precious opal, a stone of fire.