In the moonlight he could see the sheer cliff rising from the water for a great distance along the shore--far beyond the precincts of the temple and the palace--towering high above him, a seemingly impregnable barrier against his return. Swimming close in, he skirted the wall searching diligently for some foothold, however slight, upon its smooth, forbidding surface. Above him and quite out of reach were numerous apertures, but there were no means at hand by which he could reach them. Presently, however, his hopes were raised by the sight of an opening level with the surface of the water. It lay just ahead and a few strokes brought him to it--cautious strokes that brought forth no sound from the yielding waters. At the nearer side of the opening he stopped and reconnoitered. There was no one in sight. Carefully he raised his body to the threshold of the entrance-way, his smooth brown hide glistening in the moonlight as it shed the water in tiny sparkling rivulets. Before him stretched a gloomy corridor, unlighted save for the faint illumination of the diffused moonlight that penetrated it for but a short distance from the opening. Moving as rapidly as reasonable caution warranted, Tarzan followed the corridor into the bowels of the cave. There was an abrupt turn and then a flight of steps at the top of which lay another corridor running parallel with the face of the cliff. This passage was dimly lighted by flickering cressets set in niches in the walls at considerable distances apart. A quick survey showed the ape-man numerous openings upon each side of the corridor and his quick ears caught sounds that indicated that there were other beings not far distant--priests, he concluded, in some of the apartments letting upon the passageway. To pass undetected through this hive of enemies appeared quite beyond the range of possibility. He must again seek disguise and knowing from experience how best to secure such he crept stealthily along the corridor toward the nearest doorway. Like Numa, the lion, stalking a wary prey he crept with quivering nostrils to the hangings that shut off his view from the interior of the apartment beyond. A moment later his head disappeared within; then his shoulders, and his lithe body, and the hangings dropped quietly into place again. A moment later there filtered to the vacant corridor without a brief, gasping gurgle and again silence. A minute passed; a second, and a third, and then the hangings were thrust aside and a grimly masked priest of the temple of Jad-ben-Otho strode into the passageway.