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 sound 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 would 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 cave branched and rejoined and they soon lost all sense of direction.

Walking was 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 way time was running out. 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, silver 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.