The walls threw back his voice mockingly. There was no entrance that he could see except the golden door, and none could have entered or departed through that without his knowledge. This much was indisputable: Yelaya had been replaced on the dais within the few minutes that had elapsed since Muriela had first left the chamber to be seized by Gwarunga; his ears were still tingling with the echoes of Muriela's scream, yet the Corinthian girl had vanished as if into thin air. There was but one explanation that offered itself to the Cimmerian, if he rejected the darker speculation that suggested the supernatural--somewhere in the chamber there was a secret door. And even as the thought crossed his mind, he saw it. In what had seemed a curtain of solid marble, a thin perpendicular crack showed, and in the crack hung a wisp of silk. In an instant he was bending over it. That shred was from Muriela's torn skirt. The implication was unmistakable. It had been caught in the closing door and torn off as she was borne through the opening by whatever grim beings were her captors. The bit of clothing had prevented the door from fitting perfectly into its frame. Thrusting his dagger-point into the crack, Conan exerted leverage with a corded forearm. The blade bent, but it was of unbreakable Akbitanan steel. The marble door opened. Conan's sword was lifted as he peered into the aperture beyond, but he saw no shape of menace. Light filtering into the oracle chamber revealed a short flight of steps cut out of marble. Pulling the door back to its fullest extent, he drove his dagger into a crack in the floor, propping it open. Then he went down the steps without hesitation. He saw nothing, heard nothing. A dozen steps down, the stair ended in a narrow corridor which ran straight away into gloom. He halted suddenly, posed like a statue at the foot of the stair, staring at the paintings which frescoed the walls, half visible in the dim light which filtered down from above. The art was unmistakably Pelishtim; he had seen frescoes of identical characteristics on the walls of Asgalun. But the scenes depicted had no connection with anything Pelishtim, except for one human figure, frequently recurrent: a lean, white-bearded old man whose racial characteristics were unmistakable. They seemed to represent various sections of the palace above. Several scenes showed a chamber he recognized as the oracle chamber with the figure of Yelaya stretched upon the ivory dais and huge black men kneeling before it. And there were other figures, too--figures that moved through the deserted palace, did the bidding of the Pelishtim, and dragged unnamable things out of the subterranean river. In the few seconds Conan stood frozen, hitherto unintelligible phrases in the parchment manuscript blazed in his brain with chilling clarity. The loose bits of the pattern clicked into place. The mystery of Bît-Yakin was a mystery no longer, nor the riddle of Bît-Yakin's servants.