Carnes reached toward the table for his light. Before he could reach it he was frozen into immobility. From the corner of his eye he could watch the doctor. Dr. Bird was struggling to bring the light back on the moles which stood before them. Great beads of sweat stood out on his forehead. Inch by inch he moved the light closer to his goal, but Carnes could see that his thumb was stealing up toward the switch b.u.t.ton. His breath came in sobs. Suddenly the light went out.

For some time the two men sat motionless on the bench unable to speak or move. One of the moles stepped before them and gave a mental command. The two rose to their feet. For a mile or more they followed their guide, then, at a silent command, they turned to the right for a few steps and stopped. In another moment, the numbing influence had departed.

"Are you all right, Carnes?"

"Yes, right as can be. Doctor, what were those things? Where are we?

What's it all about?"

"We'll find out in time, I guess," replied the doctor with a chuckle.

"Carnes, isn't this the darnedest thing we've ever been through?

Captured half a mile underground by a race of giant talpidae before whose mental orders we are as helpless as children. Did you understand any of their talk?"

"Talk? I didn't hear any."

"Well, mental conversation then. They made no sound."

"No. All I understood was the orders I obeyed."

"I got a great deal of it," the doctor said. "We are evidently in or near a sort of central community of these fellows. They spoke; thought is a better word; they thought of doing away with us but decided to wait until they consulted someone with more authority. You see, we are not airplane pilots. Captain Garland was taken at once to the place where they have other aviators imprisoned."

"What do they want of pilots underground?"

"I couldn't quite get that. There was another thought that I am not sure that I interpreted correctly. If I did, there is some man of the upper world down here in a position of considerable authority among them. He has some use for pilots, but what use, I don't know. We are to be held until he is consulted."

"Who could it be?"

"I can only think of one man. Carnes, and I hope I'm wrong. I don't have to name him."

"You mean--?"

"Ivan Saranoff. We haven't heard of him or had any activity from him for the last eight months. We know that he had a subterranean borer with which he has penetrated deep into the earth. Isn't it possible that he has, at some time in his explorations, come into contact with these fellows and made friends with them?"

"It's possible, Doctor, but I hoped we had killed him when we destroyed his borer."

"So did I, but he seems to bear a charmed life. Several times we have thought him dead, only to have him show up with some new form of devil's work. It is too much to hope that we have succeeded in doing away with him. Did you notice one thing? Those fellows were helpless while I held the light on them. The one which was holding us captive got so interested in the discussion about our fate that he momentarily forgot us. That was when I got my light. Until I turned the light away from them, we were free men."

"That's right," answered the secret service man.

"Remember that. The next time we get a light on a bunch of them, hold them in the beam until we can make terms."

"If we ever get hold of a light again."

"I have a light they didn't get, probably because I didn't think of it while they were around. It is one of those fountain pen battery affairs and they probably took it for a pen. I won't turn it on now, partly to save it and partly not to let them know we have it. Let's see what our prison is like."

They felt their way around the room. It proved to be eight paces by ten in size. Like the tunnels it was floored with crepe rubber or some similar substance which gave out no sound of footsteps, yet was firm underfoot. The room was furnished with two beds, a table and two chairs. There was no sign of a door.

"That's that," exclaimed the doctor when they had finished their exploration. "I'm hungry. I wonder when we eat. h.e.l.lo, here comes one of the fellows now."

Carnes made no reply. As the doctor's speech ended, a wave of mental power enveloped the room. One of the moles entered, moved over to the table for an instant and then left the room. An earthly odor of vegetables pervaded the room.

"My question is answered," said the doctor. "We eat now."

He moved to the table. On it had been placed dishes containing three different types of roots. Two of them proved to be palatable, but the third was woody and bitter. The prisoners made a hearty meal from the two they relished. For an hour they sat waiting.

"Here they come again!" exclaimed the doctor. "We are going before the person I spoke of. Can't you get their thoughts?"

"No, I can't, Doctor. I can understand when I get a command, but aside from those times everything is a blank to me."

"My mental wave receiver, if that's what it is, must be attuned to a different frequency than yours, for I can hear them talking to one another. I guess I should say that I can feel them thinking to one another. At any rate, they want us to follow. Come along, the road will be open and level."

The doctor stepped out confidently with Carnes at his heels. For half a mile they went forward. Presently they halted.

"We are in a big chamber here, Carnes," whispered the doctor, "and there is someone before us. We'll have some light in a minute."

His prophecy was soon fulfilled. A vague glimmer of light began to fill the cavern in which they stood. As it grew stronger they could see a raised dais before them on which were seated three figures. Two of them were the giant moles. Each of the moles wore a helmet which covered his head completely, with no sign of lenses or other means of vision. It was the central figure, however, which held the attention of the prisoners.

Seated on a chair and regarding, them with an expression of sardonic amus.e.m.e.nt was a man. Above a high forehead rose a thin scrub of white hair. Keen brown eyes peered at them from under almost hairless brows.

The nose was high bridged and aquiline and went well with his prominent cheekbones. His mouth was a mere gash below his nose, framed by thin bloodless lips. The lips were curled in a sneer, revealing yellow teeth. The whole expression of the face was one of revolting cruelty.

"So," said the figure slowly, "fate has been kind to me. My friends, Dr. Bird and Operative Carnes have chosen to pay me a long visit. I am greatly flattered."

The thin metallic voice with its noticeable accent struck a familiar chord.

"Saranoff!" gasped Carnes.

"Yes, Mr. Carnes, Saranoff. Professor Ivan Saranoff, of the faculty of St. Petersburg once. Now merely Saranoff, the scourge of the bourgeois."

"I hoped we had killed you," murmured Carnes.

"It was no fault of Dr. Bird's that he failed," replied the Russian with an excess of malevolence in his voice. "His method was a correct one. Merely the fortuitous fact that we had just pierced one of the tunnels of the Selom, and I was away from my borer exploring it, saved me. You did me a good turn, Doctor, without meaning to. You destroyed an instrument on which I had relied. In doing so, you unwittingly delivered into my hands a power greater than any I had dreamed of--the Selom."

"What can a mental cripple like you do with blind allies like them?"

asked Dr. Bird with a contemptuous laugh. The Russian half rose from his seat in rage. For a moment his hand toyed with a switch before him. The sardonic sneer came back into his face and he dropped back into his seat.

"You nearly provoked me to destroy you, Doctor," he said, "but cold calculation saved you. Since you will never return to the upper world, save when and as I decree, I have no objection to telling you. The Selom are not blind. Their eyes are under the skin as is the case with many of the talpidae, but for all that they can see very well. Their eyes function on a shorter wave than ours, a wave so short that it readily penetrates through miles of earth and rock. This cavern is now flooded with it. Visible light, the light by which we see, is limited to their eyes, hence the helmets which you see. They can see through those helmets as well as you or I can see through air."

"What do you intend to do with us?"

"Ah, Doctor, there you hit me in a tender spot. I have a sore temptation to close this switch on which my hand rests. Were I to do so, both you and Mr. Carnes would vanish forevermore. I have, however, conceived a very real affection for you two. Your brains, Doctor, working in my behalf instead of against me would render me well-nigh omnipotent. Mr. Carnes has a certain low cunning which I can also use to advantage. Both of you will join me."