Shades of MercyAfter a career in Army intelligence, Porter Beck is back in Nevada, doing the same lawman's job his father once did. His sparsely populated jurisdiction is usually very quiet. But on the night of July 4th, Sheriff Beck sees a strange light streak across the dark sky. He prays it won't crash in drought stricken Lincoln County, where the wildfires are already burning. But it does, and the resultant explosion triggers an avalanche of death and