The Last Wagon Train — J.R. Roberts

Clint is approached while in Denver by a young woman who asks him if he will guide her back along the trail taken by the wagon train that brought her there when she was younger. Her mother has died recently, but her father perished years ago along that trail, and she wishes to find his grave and bring him to Denver to lie beside his wife. Clint agrees to help her, but when the search for her father's grave turns deadly, he starts to wonder what else might be buried with him?