They mounted until Conan estimated that they were above the level of the fourth floor, and then came out into a cylindrical tower, in the domed roof of which was set the bunch of fire-jewels that lighted the stair. Through gold-barred windows, set with unbreakable crystal panes, the first windows he had seen in Xuchotl, Conan got a glimpse of high ridges, domes and more towers, looming darkly against the stars. He was looking across the roofs of Xuchotl. Olmec did not look through the windows. He hurried down one of the several stairs that wound down from the tower, and when they had descended a few feet, this stair changed into a narrow corridor that wound tortuously on for some distance. It ceased at a steep flight of steps leading downward. There Olmec paused. Up from below, muffled, but unmistakable, welled a woman's scream, edged with fright, fury and shame. And Conan recognized Valeria's voice. In the swift rage roused by that cry, and the amazement of wondering what peril could wring such a shriek from Valeria's reckless lips, Conan forgot Olmec. He pushed past the prince and started down the stair. Awakening instinct brought him about again, just as Olmec struck with his great mallet-like fist. The blow, fierce and silent, was aimed at the base of Conan's brain. But the Cimmerian wheeled in time to receive the buffet on the side of his neck instead. The impact would have snapped the vertebræ of a lesser man. As it was, Conan swayed backward, but even as he reeled he dropped his sword, useless at such close quarters, and grasped Olmec's extended arm, dragging the prince with him as he fell. Headlong they went down the steps together, in a revolving whirl of limbs and heads and bodies. And as they went Conan's iron fingers found and locked in Olmec's bull-throat. The barbarian's neck and shoulder felt numb from the sledge-like impact of Olmec's huge fist, which had carried all the strength of the massive forearm, thick triceps and great shoulder. But this did not affect his ferocity to any appreciable extent. Like a bulldog he hung on grimly, shaken and battered and beaten against the steps as they rolled, until at last they struck an ivory panel-door at the bottom with such an impact that they splintered it down its full length and crashed through its ruins. But Olmec was already dead, for those iron fingers had crushed out his life and broken his neck as they fell. * * * * * Conan rose, shaking the splinters from his great shoulder, blinking blood and dust out of his eyes.