And so Tarzan of the Apes forged steadily ahead toward Opar's ruined ramparts and behind him slunk Werper, jackal-like, and only God knew what lay in store for each.
At the edge of the desolate valley, overlooking the golden domes and minarets of Opar, Tarzan halted. By night he would go alone to the treasure vault, reconnoitering, for he had determined that caution should mark his every move upon this expedition.
With the coming of night he set forth, and Werper, who had scaled the cliffs alone behind the ape-man's party, and hidden through the day among the rough boulders of the mountain top, slunk stealthily after him. The boulder-strewn plain between the valley's edge and the mighty granite kopje, outside the city's walls, where lay the entrance to the passage-way leading to the treasure vault, gave the Belgian ample cover as he followed Tarzan toward Opar.
He saw the giant ape-man swing himself nimbly up the face of the great rock. Werper, clawing fearfully during the perilous ascent, sweating in terror, almost palsied by fear, but spurred on by avarice, following upward, until
