The walls glowed with a diffused light. From here the Terran could count at least four levels under him, with perhaps another. The bottom two ought to be supplies and general storage. Then the engine room, tech labs above, and next to the control cabin the living quarters.

Through the fabric of the ship, shivering up his body from the soles of his feet, he could feel the vibration of engines at work. One such must control the force field which ringed this canyon, perhaps even powered the weapons the invaders could turn against any assault.

Ross whirled about, his Foanna cloak in a wide swing. There was one control which he knew. Yes, again the board was the same as the one he was familiar with. His hand plunged out and down, raking the lever from one measure point to the very end of the slit in which it moved. Then he planted himself with his back to the wall. Whoever came up the well hunting the cause for the failure would be facing the other way. Ross crouched a little, pushing the cape well back on his shoulders to free his arms. There was a feline suppleness in his stance just as a jungle cat might wait coming of its prey.

What he heard was a shout below, the click of foot-gear on the rungs of the level ladder. Ross's lips drew back in a snarl which was also feline. He thought that would do it! Spacemen were ultra-sensitive to any failure in air flow.

White head, bare of any hair, thin shoulders a little hunched under the blue-green-lavender stuff of the Baldies' uniforms.... Head turning now so that the eyes could see the necessary switch. An exclamation from the alien and—

But the Baldy never had a chance to complete that turn, look behind him. Ross sprang and struck with the side of his hand. The hairless head snapped forward. His hands already hooked in the other's armpits, the Terran heaved the alien up and over onto the deck of the control cabin. It was only when he was about to bind his captive that Ross discovered the Baldy was dead. A blow calculated to stun the alien had been too severe. Breathing a little faster, the Terran rolled the body back and hoisted it into the navigator's swing-seat, fastening it with the take-off belts. One down—how many left?

He had little time to wonder, for before he could reach the well once again there was a call from below—sharp and demanding. The Terran searched his victim, but the Baldy was unarmed.

Again a shout. Then silence—too complete a silence. How could they have guessed trouble so quickly. Unless, unless the Baldies' mental communication had been at work ... they might even now know their fellow was dead.

But not how he died. Ross was prepared to grant the Baldies super-Terran abilities, but he did not see how they could know what had happened here. They could only suspect danger, not know the form it had taken. And sooner or later one of them must come to adjust the switch. This could be a duel of patience.

Ross squatted at the edge of the well, trying to make his ears supply him with hints of what might be happening below. Had there been an alteration in the volume of vibration? He set his palm flat to the deck, tried to deduce the truth. But he could not be sure. That there had been some slight change he was certain.