"I am suddenly so tired, Divine One!" she gasped. She seemed hardly able to walk. Craig could not understand. Snatching a glance backwards, he saw that the Pharaoh, too, seemed to be strangely tiring--but gaining nevertheless.... * * * * * He was practically carrying the suddenly exhausted girl when they came to the cleft in the ice from which he had dug her the day before. There was no time to get across, for before they could climb the other side Shabako would be on them. Wes gripped the handle of his blade. Here the last fight would have to be made. "Go down the cleft, out of the way!" he told the girl rapidly. He did not have time to help her; he swung round just in time to parry a slash of Shabako's sword with his own. Then Wes Craig stepped back and stared at his opponent, a peculiar look in his eyes. It might have been merely from the force of his first swipe, or he might have slipped--but Shabako staggered drunkenly and barely avoided falling. With an oath, he came erect and once more charged at the American. It was easy for Wes to avoid his thrust; it would have been childishly easy to drive his blade through the Pharaoh's unguarded chest. But somehow Craig withheld his attack, and only peered more closely at the other. He rubbed his hand across his eyes. What he was seeing was incredible. For Shabako's face was going a ghastly white; and, as Wes watched, he groaned, tried to raise his sword arm for another blow--and could not. He staggered, legs askew, lurched crazily forward, stumbled, and at last pitched down on the ice near the cleft. Then his great body rolled over, arms flung wide, and lay still. And the face of Pharaoh Shabako stared unseeingly up at the darkening sky.... Then, in a flash, understanding came to Wes Craig. "Oh, God!" he cried. "The Kundrenaline!" He had forgotten completely about the liquid he had infused into Shabako's veins. Its potency, adequate to the tremendous task of revitalizing a long-dead heart, had given out--hastened, no doubt, by the great physical exertions of the man, and made sudden by the return to the biting air of the ice fields. The liquid was only for emergency use, anyway, and supposed to serve for a period of but hours, after which the heart was intended to carry on alone. Shabako's heart had not been able to carry on any longer.... * * * * * Wes Craig was afraid to think, afraid almost to look, to see how Taia had stood the shock. Her sudden weariness became at once all too clear to him.... Slowly he turned and looked down into the cleft. He saw her--a slender, quiet little figure, flat on the ice by the body of her slain lover. He leaped down the slippery bank and ran to her side; knelt there, and grasped her cold white hand.