"I have been curious to ask you," said Tarzan, "how Doria dared come to the stadium when her life is constantly in danger should her beauty become known to the Queen?"

"She is always disguised when she goes abroad," replied Gemnon. "A few touches by an expert hand and hollows appear in her cheeks and beneath her eyes, her brow is wrinkled; and behold! she is no longer the most beautiful woman in the world. Nemone would not give her a second thought if she saw her, but still care is taken to see that Nemone does not see her too closely even then. It is informers we fear the most. Thudos never sells a slave who has seen Doria, and once a new slave enters the palace walls he never leaves them again until long years of service have proved him, and his loyalty is unquestioned.

"It is a monotonous life for Doria, the penalty she pays for beauty; but all that we can do is hope and pray that relief will come some day in the death of Nemone or the elevation of Alextar to the throne."

Valthor was asleep on Tarzan's couch when the ape-man entered his bedroom. He had had little rest since his capture, and, in addition, he was suffering from a slight wound; so Tarzan moved softly that he might not disturb him and made no light in the room, the darkness of which was partially dispelled by the moonlight.

Spreading some skins on the floor against the wall opposite the window, the ape-man lay down and was soon asleep, while in the apartment above him two men crouched in the dark beside the window that was directly above that in Tarzan's bedroom.

For a long time they crouched there in silence. One was a large, powerful man; the other smaller and lighter. Fully an hour passed before either moved other than to change a cramped position for one more comfortable; then the smaller man arose. One end of a long rope was knotted about his body beneath his armpits; in his right hand he carried a slim dagger-sword.

Cautiously and silently he went to the window and looked out, his careful gaze searching the grounds below; then he sat on the sill and swung his legs through the window. The larger man, holding the rope firmly with both hands, braced himself. The smaller turned over on his belly and slid out of the window. Hand over hand, the other lowered him; his head disappeared below the sill.

Very carefully, so as to make no noise, the larger man lowered the smaller until the feet of the latter rested on the sill of Tarzan's bedroom window. Here the man reached in and took hold of the casing; then he jerked twice upon the rope to acquaint his fellow with the fact that he had reached his destination safely and the other let the rope slip through his fingers loosely as the movements of the man below dragged it slowly out.

The smaller man stepped gingerly to the floor inside the room. Without hesitation he moved toward the bed, his weapon raised and ready in his hand. He made no haste; his one purpose for the present appeared to be the achievement of absolute silence. It was evident that he feared to awaken the sleeper. Even when he reached the bed he stood there for a long time searching with his eyes for the right spot to strike that the blow might bring instant death. The assassin knew that Gemnon slept in another bedroom across the living room; what he did not know was that Valthor, the Athnean, lay stretched on the bed beneath his keen weapon.

As the assassin hesitated, Tarzan of the Apes opened his eyes. Though the intruder had made no sound his mere presence in the room had aroused the ape-man; perhaps the effluvium from his body, impinging upon the sensitive nostrils of the sleeping beast-man, carried the same message to the alert brain that sound would have carried.