across the sand. Ahead of them the sun sank in a red wave of color and it was six o'clock. By the time they reached the tower it was seven and Brion's nerves felt as if they were writhing under his skin.
Even though it looked like suicide, attacking the tower brought blessed relief. It was movement and action, and for moments at a time he forgot the bombs hanging over his head.
The attack was nerve-wrackingly anticlimactic. They used the main entrance, Ulv ranging soundlessly ahead. There was no one in sight. Once inside they crept down towards the lower rooms where the radiation had been detected. Only gradually did they realize that the magter tower was completely empty.
'Everyone gone,' Ulv grunted, sniffing the air in every room that they passed. 'Many magter were here earlier, they are gone now.'
'Do they often desert their towers?' Brion asked.
'Never. I have never heard of it happening before. I can think of no reason why they should do a thing like this.'
'Well I can,' Brion told him. 'They would leave their home if they took something with them of greater value. The bombs. If the bombs were hidden here, they might move them after the attack.' Sudden fear hit him. 'Or they might move them because it is time to take them—to the launcher! Let's get out of here, the quickest way we can.'
'I smell air from outside,' Ulv said, 'coming from down there. This cannot be, because the magter have no entrances this low in their towers.'
'We blasted one in earlier—that could be it. Can you find it?'
Moonlight shone ahead as they turned an angle of the corridor, and stars were visible through the gaping opening in the wall.
'It looks bigger than it was,' Brion said, 'as if the magter enlarged it.' He looked through and saw the tracks on the sand outside. 'As if they enlarged it to bring something bulky up from below—and carried it away in whatever made those tracks!'
Using the opening themselves they ran back to the sandcar. Brion ground it fiercely around and turned the headlights on the tracks. There were the marks of a sandcar's treads, half obscured by thin, unmarked wheel tracks. He turned off the lights and forced himself to move slowly and to do an accurate job. A quick glimpse of his watch showed him there were four hours left to go. The moonlight was bright enough to illuminate the tracks. Driving with one hand he turned on the radio transmitter, already set for Krafft's wave length.
When the operator acknowledged his signal Brion reported what they had discovered and his conclusions. 'Get that message to Commander Krafft now. I can't wait to talk to him—I'm following the tracks.' He killed the transmission and stamped on the accelerator. The sandcar churned and bounced down the track.
'They are going to the mountains,' Ulv said half an hour later, as the tracks still pointed straight ahead. 'There are caves here and many magter have been seen near them, that is what I have heard.'
The guess was correct. Before nine o'clock the ground humped into a range of foothills and the darker masses of mountains could be seen behind them, rising up to obscure the stars.
'Stop the car here,' Ulv said, 'The caves begin not too far ahead. There may be magter watching or listening, so we must go quietly.'
Brion followed the deep-cut grooves, carrying the radio. Ulv came and went on both sides, silently as a shadow, scouting for hidden watchers. As far as he could discover there were none.
By nine-thirty Brion realized they had deserted the sandcar too soon. The tracks wound on and on, and seemed to have no end. They passed some caves, Ulv pointed them out to him, but the tracks never stopped. Time was running out and the nightmare stumbling through the darkness continued.
'More caves ahead,' Ulv said. 'Go quietly.'
They came cautiously to the crest of the hill, as they had done so many times before, and looked into the shallow valley beyond. Sand covered the valley floor, and the light of the setting moon shone over the tracks at a flat angle, setting them off sharply as lines of shadow. They ran straight across the sandy valley and disappeared into the dark mouth of a cave on the far side.
Sinking back behind the hilltop, Brion covered the pilot light with his hand and turned on the transmitter. Ulv stayed above him, staring at the opening of the cave.
'This is an important message,' Brion whispered into the mike, 'Please record.' He repeated this for thirty seconds, glancing at his watch to make sure of the time, since the seconds of waiting stretched to minutes in his brain. Then, clearly as possible without raising his voice above a whisper, he told of the discovery of the tracks and the cave.
'... The bombs may or may not be in here, but we are going in to find out. I'll leave my personal transmitter here with the broadcast power turned on, so you can home on its signal. That will give you a directional beacon to find the cave. I'm taking the other radio in, it has more power. If we can't get back to the entrance, I'll try a signal from inside. I doubt if you will hear it because of the rock, but I'll try. End of transmission. Don't try to answer me because I have the receiver turned off. There are no earphones on this set and the speaker would be too loud here.'
He switched off, held his thumb on the button for an instant, then flicked it back on.
'Good-by, Lea,' he said, and killed the power for good.
They circled and reached the rocky wall of the cliff. Creeping silently in the shadows here they slipped up on the dark entrance of the cave. Nothing moved ahead and there was no sound from the entrance of the cave. Brion glanced at his watch and was instantly sorry.
Ten-thirty.
The last shelter concealing them was five meters from the cave. They started to rise, to rush the final distance when Ulv suddenly waved Brion down. He pointed to his nose, then to the cave. He could smell the magter there.
A dark figure separated itself from the greater darkness of the cave mouth. Ulv acted instantly. He stood up and his hand went to his mouth; air hissed faintly through the tube in his hand. Without a noise the magter folded and fell to the ground. Before the body hit Ulv crouched low and rushed in. There was the sudden scuffling of feet on the floor, then silence.
Brion walked in, gun ready and alert, not knowing what he would find. His toe pushed against a body on the ground and from the darkness Ulv whispered. 'There were only two. We can go on now.'
Finding their way through the cave was a maddening torture. They had no light, nor could they dare use one if they had. There were no wheel marks to follow on the stone floor. Without Ulv's sensitive nose they would have been completely lost. The caves branched and rejoined and they soon lost all sense of direction.
Walking was maddening and almost impossible. They had to grope with their hands before them like blind men. Stumbling and falling against the rock, their fingers were soon throbbing and raw from brushing against the rough walls. Ulv followed the scent of the magter that hung in the air where they had passed. When it grew thin he knew they had left the frequently used tunnels and entered deserted ones. They could only retrace their steps and start again in a different direction.
More maddening than the walking was the time. Inexorably the glowing hands crept around the face of Brion's watch until they stood at fifteen minutes before twelve.
'There is a light ahead,' Ulv whispered, and Brion almost gasped with relief. They moved slowly and silently until they stood, concealed by the darkness, looking out into a domed chamber brightly lit by glowing tubes.
'What is it,' Ulv asked, blinking in the painful wash of illumination after the long darkness.
Brion had to fight to control his voice, to stop from shouting.
'The cage with the metal webbing is a jump-space generator. The pointed, sliver shapes next to it are bombs of some kind, probably the cobalt bombs. We've found it!'
His first impulse was to instantly send the radio call that would stop the waiting fleet of H-bombers. But an unconvincing message would be worse than no message at all. He had to describe exactly what he saw here so the Nyjorders would know he wasn't lying. What he told them had to fit exactly with the information they already had about the launcher and the bombs.
The launcher had been jury-rigged from a ship's jump-space generator, that was obvious. The generator and
