He kept on walking, expecting to feel the impact of another thrust momentarily, but he was not molested again. _They must be getting wise_, he thought. _They know they can't get through my boots, and so they're leaving me alone. That way they don't call attention to themselves._ A new, more chilling question struck him: _Just how smart are they?_ He had made it to the wall and was climbing up the treacherous slope when the airlock door opened, and someone stood outlined in the bright circle of light that cut into the inky blackness. An amplified voice filled the valley and ricocheted back off the walls of the mountains, casting eerie echoes down on the lone man on the desert. "CAPTAIN WAYNE! THIS IS COLONEL PETERSEN SPEAKING. DON'T YOU REALIZE THAT YOU'RE A SICK MAN? YOU MAY DIE OUT THERE. COME BACK. THAT'S AN ORDER, CAPTAIN. REPEAT: COME BACK. THAT'S AN ORDER!" "I'm afraid an order from you just doesn't hold much weight for me right now, Colonel," Wayne said quietly, to himself. Silently he went on climbing the escarpment, digging into the rough rock. He kept on climbing until he found the niche for which he had been heading. He dragged himself in and sat down, as comfortably as possible. He began to wait. * * * * * Dawn came in less than three hours, as Fomalhaut burst up over the horizon and exploded in radiance over the valley. With dawn came a patrol of men, slinking surreptitiously across the valley, probably with orders to bring him in. Wayne was ensconced comfortably in his little rock niche, hidden from the men in the valley below, but with a perfect view of everything that went on. The wind whistled around the cliffs, ceaselessly moaning a tuneless song. He felt like standing up and shouting wildly, "Here I am! Here I am!" but he repressed the perverse urge. The patrol group stood in a small clump in the valley below, seemingly waiting for something. Moments passed, and then it became apparent what that something was. Hollingwood, the metallurgist, appeared, dragging with him the detector. They were going to look for Captain Wayne with it, just as they had searched out the double-nucleus beryllium. Wayne frowned. It was a possibility he hadn't thought about. They could easily detect the metal in his boots! And he didn't dare take them off; he'd never make it back across that hellish stretch of sand without them. He glanced uneasily at his watch. _How much longer do I have to keep evading them?_ he wondered. It was a wearing task. It looked as though it would be much too long. The muzzle of the detector began to swing back and forth slowly and precisely, covering the valley inch by inch. He heard their whispered consultations drifting up from below, though he couldn't make out what they were saying. * * * * *