"Well, there goes one nice neat theory up in smoke!" he commented. "No, your skull doesn't appear on any of our maps, and so probably my cavern does not exist either. They may both be smoke screens——"

"What——?" But Shann never finished that query.

A wind was rising in the desert to blow across the slit which held the river, carrying with it a fine shifting of sand which coasted down into the water as a gray haze, coating men, animals, and raft, and sighing as snow sighs when it falls.

Only that did not drown out another cry, a thin cry, diluted by the miles of land stretching behind them, but yet carrying that long ululating howl they had heard in the Throg camp. Thorvald grinned mirthlessly.

"The hound's on trail."

He bent to the pole, using it to aid the pace of the current. Shann, chilled in spite of the sun's heat, followed his example, wondering if time had ceased to fight on their side.


6. THE HOUND

The sun was a harsh ball of heat baking the ground and then, in some odd manner, drawing back that same fieriness. In the coolness of the eastern mountains Shann would not have believed that Warlock could hold such heat. The men discarded their jackets early as they swung to dip the poles. But they dared not strip off the rest of their clothing lest their skin burn. And again gusts of wind now drove sand over the edge of the cut to blanket the water.