In complete silence the back wall of the cave revolved and he slipped into the opening, catching the door halfway open and holding it while the others came through.

When they were past, he released it. The wall slid soundlessly back into its place, and the cave was empty once again.

Chapter 14: "Only When I Am In Costume."

Down the tunnel they crept, Zoltan in the lead. Without hesitation he guided them through the labyrinth for several minutes, turning at intersections where yellow blazes indicated the trail. Their path rose slightly, but without the irregularities Napoleon and Illya had found the night before. At one intersection, Zoltan paused and pointed. "Here," he whispered, "is where we entered the tunnel last night."

They continued, now in totally strange territory. After a good quarter of an hour, Napoleon gradually became aware of noises somewhere ahead—uncertain and indefinite so far, but definitely not natural.

As they continued walking, the sounds became clearer. Some of them were voices, and some were mechanical. They had an odd reverberant quality, carried as they were along the tunnels and corridors for indefinite distances, distorted, echoed and amplified by the baffles of rock they traveled among. But they were closer, and still approaching.

At last Zoltan stopped, and extinguished his light for a moment. As their eyes grew accustomed to the darkness they became aware that they could still distinguish the shadows of those ahead of them, and tell where the corridor walls were. The very faintest of blue glows showed ahead. Zoltan grouped the other three in a close huddle, and address them in the faintest of whispers.

"There's something not far ahead. I think it is a large cave with many people working in it. We will go ahead—Hilda, you wait behind us where you can see what happens."

"Wait a minute," said Napoleon. "I think it's very noble to try to keep Hilda out of this, but if something happens I want my life to depend on the best-qualified person around, rather than the least. Illya?"

"I quite agree. Do you stay, or shall I?"

"I think you should."

"All right. How long do you expect to be gone?"

"Not long. It sounds like there's a fair-sized group out there. I don't intend to tackle more than half a dozen. If it turns out there are more, we can just sneak right out again and radio for reinforcements."

Illya nodded, and Zoltan asked, "Everything arranged?"

"Right," said Napoleon. "We just go far enough to get a good look at what's going on, and then get out again."

Zoltan snapped his light off, and let Napoleon lead the way.

Around the bend to the left, the light grew brighter—and around a bend to the right it continued to increase. Now the texture of the rock surrounding them could be distinguished, and the four figures were all clearly visible to each other. Napoleon stopped short of the next bend and gestured to the others to wait while he went on.

Slowly and cautiously he cocked an eye around the corner of the tunnel, squinting against the brightness of the alien-looking fluorescent lights that hung from the ceiling of the large cavern which opened before his gaze.

The walls were of rough natural stone, but the floor had been smoothed artificially. There were no more than half a dozen men in plain sight, all working around the end of a wide conveyor belt that ran out of the cavern to the right. They seemed to be occupied with loading large crates, unlabeled but of sturdy construction, onto this belt, which carried them away to an unknown destination. Along the walls were stacks and stacks of apparently empty crates of identical design.

The conveyor was being loaded from a diminishing pile of boxes which seemed quite heavy—each took two men to lift it onto the belt. Napoleon could not see any indication of what the weight was, but his first guesses were heavy machinery, or ammunition.

He watched in silence a few more minutes while the last of the boxes rolled off into the darkness, and then was moderately startled when the six men climbed onto the belt and rode off after their burdens. About a minute later the conveyor belt rumbled gently to a stop and he became aware that it had not really been silent after all—there had been the low vibration of the driving motors.

Then he turned and crept back to where the others waited. "There's a cave just around the corner," he whispered, when they had gathered close around him. "There were some men working in it, but they're gone now. I'm going out to have a quick look around. Come as far as the entrance and keep an eye on me."

They followed like shadows, and stopped at the mouth of the tunnel. Once again Napoleon looked out carefully, and when he saw no one he stepped out into the light.

Now he could see that the conveyor belt ran through a hole in the wall next to a flight of steps leading up out of sight, and that it started up parallel to them just within the hole. The surface of the belt was ridged into sections which apparently folded flat on the bottom but served to lift the load on the ascent. There was another belt, level, which ran into the room and ended a few yards away on his right, where he couldn't have seen it before.

He started towards it, hoping to find an explanation of all this activity in the cave next door. Just then the scrape of a shoe on rock warned him of someone's approach.

He knew he was too far from the tunnel to get back there safely. In a moment he had jumped forward into the darkness of the next room along the conveyor belt. He hugged the wall and listened to the cautiously approaching footsteps.

They stopped some yards away, and there were several seconds of silence. At last a voice said in English, "Come out, Mr. Solo, wherever you are."

Napoleon's stomach froze as he looked quickly around for an escape route. He eased his weight onto his other foot and started to move along the wall with infinite caution.

The voice spoke again. "Mr. Solo, your friends have been taken, but not harmed. We have neither need nor desire to harm any of you. I would much prefer that you come out peacefully, because otherwise I shall have to come in after you and I have no wish to be shot at."

Napoleon thought this was reasonable, and leveled his automatic at the entrance.

After a short wait, the voice continued, with a note of regret, "You're being coy, Mr. Solo. We could leave you in there until hunger brought you out, but we have a schedule to keep. Perhaps this will change your mind. Miss Eclary..."

There was a stifled scream which brought Napoleon a step towards the entrance before he stopped himself.

"I do regret the need for melodramatic methods, Mr. Solo. Please understand you can cause us no more than a temporary inconvenience, and under the circumstances we can afford to be most forgiving. Our work here is nearly done, and when we are through we will be far beyond your reach. You will merely be held prisoners for a few days and then released."

Napoleon strained his eyes against the darkness, but the light from the next cave revealed nothing more than stacks of something around the walls near the conveyor belt. He looked around his own position, and started nervously when he saw what looked like a human body. After a moment he realized it was something made out of metal. Were they constructing robots?

Then the voice came back again, and this time it seemed closer to the mouth of the cavern. It held a distinct note of patient regret. "All right, Mr. Solo—as you wish. We will come in and bring you out."

Napoleon was peering through the gloom at the glow of light from the other room, watching for the first sign of a silhouetted target, when there was a soft chuff from around the corner. And then there was a burst of incredible blinding actinic light which seared into his eyeballs even as he threw up his arm to protect his face.