TO A MAN standing in the gorge below, the man clinging to the sloping cliff would have been invisible, hidden from sight by the jutting ledges that looked like irregular stone steps from a distance. From a distance, also, the rugged wall looked easy to climb; but there were heart-breaking spaces between those ledges-stretches of treacherous shale, and steep pitches where clawing fingers and groping toes scarcely found a grip.One misstep, one handhold lost and the climber would have pitched backward in a headlong, rolling fall three hundred feet to the rocky canyon bed. But the man on the cliff was Francis Xavier Gordon, and it was not his destiny to dash out his brains on the floor of a Himalayan gorge.He was reaching the end of his climb. The rim of the wall was only a few feet above him, but the intervening space was the most dangerous he had yet covered. He paused to shake the sweat from his eyes, drew a deep breath through his nostrils, and once more matched eye and muscle against the brute treachery of the gigantic barrier. Faint yells welled up from below, vibrant with hate and edged with blood lust. He did not look down. His upper lip lifted in a silent snarl, as a panther might snarl at the sound of his hunters' voices. That was all. His fingers clawed at the stone until blood oozed from under his broken nails. Rivulets of gravel started beneath his boots and streamed down the ledges. He was almost there-but under his toe a jutting stone began to give way. With an explosive expansion of energy that brought a tortured gasp from him, he lunged upward, just as his foothold tore from the soil that had held it. For one sickening instant he felt eternity yawn beneath him-then his upflung fingers hooked over the rim of the crest. For an instant he hung there, suspended, while pebbles and stones went rattling down the face of the cliff in a miniature avalanche. Then with a powerful knotting and contracting of iron biceps, he lifted his weight and an instant later climbed over the rim and stared down.He could make out nothing in the gorge below, beyond the glimpse of a tangle of thickets. The jutting ledges obstructed the view from above as well as from below. But he knew his pursuers were ranging those thickets down there, the men whose knives were still reeking with the blood of his friends. He heard their voices, edged with the hysteria of murder, dwindling westward. They were following a blind lead and a false trail.Gordon stood up on the rim of the gigantic wall, the one atom of visible life among monstrous pillars and abutments of stone; they rose on all sides, dwarfing him, brown insensible giants shouldering the sky. But Gordon gave no thought to the somber magnificence of his surroundings, or of his own comparative insignificance.Scenery, however awesome, is but a background for the human drama in its varying phases. Gordon's soul was a maelstrom of wrath, and the distant, dwindling shout below him drove crimson waves of murder surging through his brain. He drew from his boot the long knife he had placed there when he began his desperate climb. Half-dried blood stained the sharp steel, and the sight of it gave him a fierce satisfaction. There were dead men back there in the valley into which the gorge ran, and not all of them were Gordon's Afridi friends. Some were Orakzai, the henchmen of the traitor Afdal Khan-the treacherous dogs who had sat down in seeming amity with Yusef Shah, the Afridi chief, his three headmen and his American ally, and who had turned the friendly conference suddenly into a holocaust of murder.