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....