A hand shaking his shoulder awoke Trakor with a start. Crouching on the branch beside him was Tharn, his magnificent body faintly discernible in the diffused light of Uda, the moon.

"Come," Tharn said. "It is time we set about locating the path used by the Ammadians in scaling the cliffside."

"At night?" Trakor asked wonderingly. "Would it not be better to wait until there is enough light to pick up the trail?"

"I have another plan," Tharn replied evasively. "Here," he added, stooping. "Place your arms about my neck."

Although he did not understand the reason behind the order Trakor followed his companion's bidding. An instant later he was swept up and out into the maze of branches while borne in Tharn's arms.

Where before much of the passage through the middle terraces of the trees had been hidden from Trakor by darkness, now the way was lighted by the moon, disclosing to the youth's horrified eyes the awful depths beneath. Gradually Trakor's fears grew less as he observed the unfailing sureness with which Tharn trod this high-flung pathway, and in its place came an abounded admiration of his agility and strength. Never before had he heard of a human who used the same avenues as little Nobar, the monkey—and used them with the same nimbleness and speed. Occasionally warriors of his tribe lay in wait for game among tree branches, but such climbing was as nothing when compared to this.

That uncanny instinct which so often had guided Tharn through unfamiliar territory did not fail him this time, and within half an hour he and his burden were gazing from the safety of a high branch at the deserted cliffside containing the caves of Gerdak.

At the sight of the familiar scene a great weight seemed to press against Trakor's heart. Was his new-found friend deserting him—returning him to certain suffering at the hands of short-tempered Gerdak? Did not Tharn know that never again would he dare to return to his own cave—that the chief would make him pay a thousandfold for championing the giant stranger?

Dreading the reply, he asked: "Why have we come back here, Tharn?"

"You told me Roban, son of Gerdak, knows the route taken by the Ammadians," said Tharn. "I am going to ask him where I may find it."