Behind the hangings there was a space of about three feet in width between them and the wall, making a passageway entirely around the room, broken only by the single entrance opposite them; this being a common arrangement especially in the sleeping apartments of the rich and powerful upon Barsoom. The purposes of this arrangement were several. The passageway afforded a station for guards in the same room with their master without intruding entirely upon his privacy; it concealed secret exits from the chamber; it permitted the occupant of the room to hide eavesdroppers and assassins for use against enemies that he might lure to his chamber. The three chiefs with a dozen warriors had had no difficulty in following the tracks of the fugitives through the dust of the corridors and chambers they had traversed. To enter this portion of the palace at all had required all the courage they possessed, and now that they were within the very chambers of O-Mai their nerves were pitched to the highest key--another turn and they would snap; for the people of Manator are filled with weird superstitions. As they entered the outer chamber they moved slowly, with drawn swords, no one seeming anxious to take the lead, and the twelve warriors hanging back in unconcealed and shameless terror, while the three chiefs, spurred on by fear of O-Tar and by pride, pressed together for mutual encouragement as they slowly crossed the dimly-lighted room. Following the tracks of Gahan and Tara they found that though each doorway had been approached only one threshold had been crossed and this door they gingerly opened, revealing to their astonished gaze the four warriors at the jetan table. For a moment they were on the verge of flight, for though they knew what they were, coming as they did upon them in this mysterious and haunted suite, they were as startled as though they had beheld the very ghosts of the departed. But they presently regained their courage sufficiently to cross this chamber too and enter the short passageway that led to the ancient sleeping apartment of O-Mai the Cruel. They did not know that this awful chamber lay just before them, or it were doubtful that they would have proceeded farther; but they saw that those they sought had come this way and so they followed, but within the gloomy interior of the chamber they halted, the three chiefs urging their followers, in low whispers, to close in behind them, and there just within the entrance they stood until, their eyes becoming accustomed to the dim light, one of them pointed suddenly to the thing lying upon the floor with one foot tangled in the coverings of the dais. "Look!" he gasped. "It is the corpse of O-Mai! Ancestor of ancestors! we are in the forbidden chamber." Simultaneously there came from behind the hangings beyond the grewsome dead a hollow moan followed by a piercing scream, and the hangings shook and bellied before their eyes.