It took all my control to keep my eyes blank, my face devoid of expression. Out of the tail of my eye I saw Foulet smiling, a vague, idiotic smile of sympathy with Fraser's glee. But suddenly the glee died--as suddenly as if a button had snapped off the current. He leaned forward, his black eyes devouring our faces. "They are afraid of me?" It was a whisper, sharply eager. "The world knows I am Master?" "Master," repeated Foulet. It wasn't quite a question, yet neither was it sufficiently definite as an answer to arouse Fraser's suspicions. To my relief it satisfied him. The congested blood drained out of his face. His eyes lost their glare. He turned and for several minutes tramped up and down the laboratory lost in thought. At last he came back to us. "I have changed my mind," he muttered. "Come with me." Without a word we followed him, out through the door and down the passageway. Out of the building he led us. The air was stirring with the first breath of dawn and along the horizon glowed a band of pure gold where the sun would soon rise. When he had walked some thirty yards from the laboratory Fraser paused. With his toe he touched a spring in the platform. A trap door instantly yawned at our feet. I suppressed a start just in time, but through my body shot a thrill of fear. My muscles tensed. My heart raced. What now? Where could a trap door, two thousand feet above the earth lead? Was he going to shove us into space because we refused to answer his questions? "Go down," Fraser ordered. * * * * * For the space of a breath we hesitated. To disobey meant certain and instant death at the hands of this soulless maniac. But to obey--to drop through this trap-door--also meant death. I took a step forward. Could we overpower him? But what if we did? There were others here beside Fraser. How many others I had no idea, but surely enough to make things impossible for Foulet and me. Yet we dared not even hesitate. To hesitate implied thinking--and a man robbed of his brain cannot think! There was no way out. Together Foulet and I stepped to the brink of the yawning hole.... For an instant we were almost blinded by a glare of rosy light that seemed to burst upon us from the earth so far below. Here was the source of that strange afterglow! Away beneath us, evidently on the sands of the Arabian desert, glowed four red eyes sending forth the rosy rays that converged at the center of the floating platform. Instantly I comprehended Fraser's scheme. The Fleotite he had invented, and of which the platform and buildings were made, was lighter than air. It followed, therefore, that if it were not anchored in some way it would instantly rise. So Fraser had anchored it with four of his magnetic rays! He had told us that he could regulate the pulling power of the ray, so what he had obviously done was to calculate to a nicety the lift of the Fleotite against the magnetism of the rays.