heard the shrill whine of three pursuit ships screaming in from the Eastern horizon— He was out of the 'copter almost as soon as it had touched, throwing a jacket over his arm, and racing for the place where the drill line ended. Because he had seen as he slid in for a landing, just what he had suspected from the topographical map. The drill didn't end in the middle of a desert at all. It went right on into the mountainside. The excavation was quite large, the entrance covered and camouflaged neatly to give the very impression that he had gotten from the air. Under the camouflage the space was crowded, stacked with crates, boxes, materials, stacked all along the walls of the tunnel. He followed the rails in, lighting his way with a small pocket flashlight when the tunnel turned a corner, cutting off the daylight. Suddenly the tunnel widened, opening out into a much wider room. He sensed, rather than saw, the immense size of the vault, smelt the odd, bitter odor in the air. With the flashlight he probed the darkness, spotting the high, vaulted ceiling above him. And below him— At first he couldn't see, probing the vast excavation before him, and then, strangely, he saw but couldn't realize what he saw. He stared for a solid minute, uncomprehending, then, stifling a gasp, he knew what he was looking at— Lights. He had to have lights, to see clearly what he couldn't believe. Frantically, he spun the flashlight, seeking a light panel, and then, fascinated, he turned the little oval of light back to the pit. And then he heard the barest whisper of sound, the faintest intake of breath, and he ducked, frozen, as a blow whistled past his ear. A second blow from the side caught him solidly in the blackness, grunting, flailing out into a tangle of legs and arms, cursing, catching a foot in his face, striking up into soft, yielding flesh— And his head suddenly exploded into a million dazzling lights as he sank unconscious to the ground— It was a tiny room, completely without windows, the artificial light filtering through from ventilation slits near the top. Shandor sat up, shaking as the chill in the room became painfully evident. A small electric heater sat in the corner beaming valiantly, but the heat hardly reached his numbed toes. He stood up, shaking himself, slapping his arms against his sides to drive off the coldness—and he heard a noise through the door as soon as he had made a sound. Muted footsteps stopped outside the