The speaker's voice ceased and in the silence the others turned to look at the black shape of the island riding the gleaming waters like a funeral barge. In its dark isolation, cut off from the land by the quiet current, it seemed a fitting theater for the grim tragedy. They gazed at it, chilled into dumbness, thinking of the murderer moving to freedom under the protection of his lie, then overtaken, and in his anguish, alone in the silence, meeting the question of his conscience. Once more the words came back to David: "Behold, He that keepeth Israel shall neither slumber nor sleep." Susan pressed against her father, awed and cold, and from old Joe, stretched in his blanket, came a deep and peaceful snore. CHAPTER III Susan was riding alone on the top of the bluffs. The evening before, three men returning from the Oregon country to the States, had bivouacked with them and told them that the New York Company was a day's march ahead, so she had gone to the highlands to reconnoiter. Just here the bluffs swept inward toward the river, contracting the bottom to a valley only a few miles in width. Through it the road lay, a well-worn path crossed as with black stripes by the buffalo runs. Susan's glance, questing ahead for the New York train, ran to the distance where the crystal glaze of the stream shrunk to a silver thread imbedded in green velvet. There was a final point where green and silver converged in a blinding dazzle, and over this the sun hung, emerging from a nebulous glare to a slowly defining sphere. Turning to the left her gaze lost itself in the endlessness of the plains. It was like looking over the sea, especially at the horizon where the land was drawn in a straight, purplish line. She could almost see sails there, small sails dark against a sky that was so remote its color had faded to an aerial pallor. As the journey had advanced the influence of these spacious areas had crept upon her. In the beginning there had been times when they woke in her an unexplained sadness. Now that was gone and she loved to ride onward, the one item of life in the silence, held in a new correspondence with the solemn immensity. It affected her as prayer does the devotee. Under its inspiration she wondered at old worries and felt herself impervious to new ones.