Xatmec shrugged his shoulders. His thoughts had never gone beyond the destruction of their foes. They could not go beyond that. Suddenly both men stiffened at a noise outside the door. "To the door, Xatmec!" hissed the last speaker. "I shall look through the Eye----" Xatmec, sword in hand, leaned against the bronze door, straining his ear to hear through the metal. His mate looked into the mirror. He started convulsively. Men were clustered thickly outside the door; grim, dark-faced men with swords gripped in their teeth--_and their fingers thrust into their ears_. One who wore a feathered head-dress had a set of pipes which he set to his lips, and even as the Tecuhltli started to shout a warning, the pipes began to skirl. The cry died in the guard's throat as the thin, weird piping penetrated the metal door and smote on his ears. Xatmec leaned frozen against the door, as if paralyzed in that position. His face was that of a wooden image, his expression one of horrified listening. The other guard, farther removed from the source of the sound, yet sensed the horror of what was taking place, the grisly threat that lay in that demoniac fifing. He felt the weird strains plucking like unseen fingers at the tissues of his brain, filling him with alien emotions and impulses of madness. But with a soul-tearing effort he broke the spell, and shrieked a warning in a voice he did not recognize as his own. But even as he cried out, the music changed to an unbearable shrilling that was like a knife in the ear-drums. Xatmec screamed in sudden agony, and all the sanity went out of his face like a flame blown out in a wind. Like a madman he ripped loose the chain, tore open the door and rushed out into the hall, sword lifted before his mate could stop him. A dozen blades struck him down, and over his mangled body the Xotalancas surged into the guardroom, with a long-drawn, blood-mad yell that sent the unwonted echoes reverberating. His brain reeling from the shock of it all, the remaining guard leaped to meet them with goring spear. The horror of the sorcery he had just witnessed was submerged in the stunning realization that the enemy were in Tecuhltli. And as his spearhead ripped through a dark-skinned belly he knew no more, for a swinging sword crushed his skull, even as wild-eyed warriors came pouring in from the chambers behind the guardroom. It was the yelling of men and the clanging of steel that brought Conan bounding from his couch, wide awake and broadsword in hand. In an instant he had reached the door and flung it open, and was glaring out into the corridor just as Techotl rushed up it, eyes blazing madly. "The Xotalancas!" he screamed, in a voice hardly human, "_They are within the door!_" Conan ran down the corridor, even as Valeria emerged from her chamber. "What the devil is it?" she called. "Techotl says the Xotalancas are in," he answered hurriedly. "That racket sounds like it." * * * * *