"My G.o.d!" he whispered. "Trapped!"

For the s.p.a.ce of a few seconds they looked one at the other.

"Will he betray us?" asked Farrington, voicing the unspoken thoughts of Fall.

"He will betray us as much as he can," said the other. "We must watch and see what happens. If he takes him into town, we are lost."

"Is there any sign of police?" asked Farrington.

They scanned the horizon, but there was no evidence of a lurking force, and they turned to watch T. B. Smith and his prisoner making their slow way across the downs. For five minutes they stood watching, then Fall uttered an exclamation.

"They are going to the cottage!" he said, and again the men's eyes met.

"Impossible," said Farrington, but there was a little glint in his eye which spoke of the hope behind the word.

Again an interval of silence. Three pairs of eyes followed the men.

"It is the cottage!" said Fall. "Quick!"

In an instant the two men were in the lift and shooting downwards; they did not stop till they reached the bas.e.m.e.nt.

"You have a pistol?" asked Farrington.

Fall nodded. They quitted the lift and walked swiftly along a vaulted corridor, lighted at intervals with lamps set in niches. On their way they pa.s.sed a door made in the solid wall to their left.

"We must get her out of this, if necessary," said Farrington in a low voice. "She is not giving any trouble?"

Dr. Fall shook his head.

"A most tactful prisoner," he said, dryly.

At the end of the corridor was another door. Fall fitted a key and swung open the heavy iron portal and the two men pa.s.sed through to a darkened chamber. Fall found the switch and illuminated the apartment. It was a little room innocent of windows, and lit as all the rest of the bas.e.m.e.nt was by cornice lamps. In one corner was a grey-painted iron door. This Fall pushed aside on its noiseless runners. There was another elevator here. The two men stepped in and the lift sunk and sunk until it seemed as though it would never come to the end. It stopped at last, and the men stepped out into a rock-hewn gallery.

It was easy to see that this was one of the old disused galleries of the old mine over which the house was built. Fall found the switch he sought and instantly the corridor was flooded with bright light.

On a set of rails which ran the whole length of the gallery to a point which was out of sight from where they stood, was a small trolley. It was unlike the average trolley in that it was obviously electrically driven. A third rail supplied the energy, and the controlling levers were at the driver's hand.

Farrington climbed to the seat, and his companion followed, and with a whirr of wheels and a splutter of sparks where the motor brush caught the rail, the little trolley drove forward at full speed.

They slowed at the gentle curves, increased speed again when any uninterrupted length of gallery gave them encouragement, and after five minutes' travel Farrington pulled back the lever and applied the brake.

They stepped out into a huge chamber similar to that which they had just left. There was the inevitable lift set, as it seemed, in the heart of the rock, though in reality it was a bricked s.p.a.ce. The two men entered and the lift rose noiselessly.

"We will go up slowly," whispered Fall in the other's ear; "it will not do to make a noise or to arouse any suspicions; we must not forget that we have T. B. Smith to deal with."

Farrington nodded, and presently the lift stopped of its own accord.

They made no attempt to open whatever door was before them. They could hear voices: one was T. B.'s, and the other was unmistakably Poltavo's, and Poltavo was speaking.

Poltavo was offering in his eager way to betray the men who sat in the darkness listening to his treachery. They heard the motor-car's arrival outside, and presently T. B.'s voice announcing his temporary retirement. They heard the slam of the door, and the key click in the lock, and then Dr. Fall stepped forward, pressed a spring in the rough woodwork in front of him and one of the panels of the room slid silently back.

Poltavo did not see his visitors until they stood over him, then he read in those hateful faces which were turned toward him an unmistakable forecast of his doom.

"What do you want?" he almost whispered.

"Do not raise your voice," said Farrington in the same tone, "or you are a dead man." He held the point of a knife at the other's throat.

"To where are you taking me?" asked Poltavo, ghastly white of face and shaking from head to foot.

"We are taking you to a place where your opportunity for betraying us will be a mighty small one," said Fall.

There was a horrible smile on his thin lips, and Poltavo, with a premonition of what awaited him beyond the tunnel, forgot the menacing knife at his throat and screamed.

Hands gripped him and strangled the cry as it escaped him. Something heavy struck him behind the ear and he lost consciousness. He awoke to find himself travelling smoothly along the rock gallery. He was half lying, half reclining on Fall's knees. He did not attempt to move; he knew now that he was in mortal peril of his life. No word was spoken when he was dragged roughly from the car, placed in another elevator and whirled upwards, emerging into a little chamber at the end of the underground corridor which ran beneath the Secret House.

A door was opened and he was thrust in without a word. He heard the clang of the steel door behind him, and the lights came on to show him that once again he was in the underground room where he had been confined before.

There was the table, there was the heavy chair, there in the far corner of the room was the barred entrance to the other elevator. Anyway he was free from the police; that was something. He was safe just so long as it suited the book of Farrington and his friend to keep him safe. What would they do? What excuse could he offer? They had overheard the conversation between himself and T. B., he knew that, and cursed his folly. He ought to have kept away from Moor Cottage. He knew there was something sinister about the place, but T. B. should have known that even better than he. Why had T. B. left him?

These and a thousand other thoughts shot through his mind as he paced the vaulted apartment. They were in no hurry to feed him. He had almost forgotten what time it was; whether it was day or night in that underground vault into which no ray of sunlight ever penetrated. They had left him with the handcuffs on his wrists; they would come and relieve him of these enc.u.mbrances. What were their plans with him? He felt his pockets carefully. T. B. had taken away the only weapon he had had, and for the first time for many years Count Poltavo was unarmed.

His heart was beating with painful rapidity and his breath came laboriously. He was terror-stricken. He turned to find the door through which he had come, and to his surprise he could not see it. So far as he could detect, the stone wall ran without a break from one end of the apartment to the other. Escape could not lie that way; of that he was satisfied. There was nothing to do but to wait, with whatever patience he could summon, to discover their plans. He did not doubt that he was to suffer. He had forfeited all right to their confidence, but if this was to be the only consequence of his ill-doing he was not greatly worried. Count Poltavo, as he had boasted before in this identical room, had been in some tight corners and had faced death in many strange and terrible guises, but the inevitability of doom was never so impressed upon his mind as it was at this moment when he lay guarded by a hundred secret forces in the tomb of the Secret House.

He had one hope, a faint one, that T. B. would discover the method of his exit from the room in Moor Cottage and would track him here.

Evidently the occupants of the Secret House had the same fear, for even here, in the quietness of his underground prison, Poltavo could hear strange whining noises, rumbling, and groaning and grinding, as though the whole of the house were changing its construction.

He had not long to wait for news. A corner lift came swiftly down and Fall stepped briskly towards his prisoner.

"T. B. Smith is in the house," he said, "and is making an inspection; he will be down here in a moment. In these circ.u.mstances I shall have to betray one of the secrets of this house." He caught the other roughly by the arm and half led, half dragged, him to a corner of the room.

Handcuffed as he was, Poltavo could offer no resistance. Dr. Fall apparently only touched one portion of the wall, but he must have moved, either with his foot or with his hand, some particularly powerful spring, for a section of the stone wall swung backwards revealing a black gap.

"Get in there," said Fall, and pushed him into the darkness.

A few moments later T. B. Smith, accompanied by three detectives, inspected the room which Poltavo had left. There was no sign of the man, no evidence of his having so recently been an occupant of his prison house. For an interminable time Poltavo stood in the darkness. He found he was in a small cell-like apartment with apparently no outlet save that through which he had come.

He was able to breathe without difficulty, for the perfect system of ventilation throughout the dungeons of the Secret House had been its architect's greatest triumph.

It seemed hours that he waited there, though in reality it was less than twenty minutes after his entrance that the door swung open again and he was called out.

Farrington was in the room now, Farrington with his trusty lieutenant, and behind them the one-eyed Italian desperado whom Poltavo remembered seeing in the power house one day, when he had been allowed the privilege of inspection.

Some slight change had been made in the room since he was there last.

Poltavo's nerves were in such a condition that he was sensitive to this variation. He saw now what the change was. The table had been drawn back leaving the chair where it was fixed.

Yes, it was a fixed chair, he remembered that and wondered why it had been screwed to the wood block floor. Dr. Fall and the engineer grasped him roughly and hurried him across the room, thrusting him into the chair.

"What are you going to do?" asked Poltavo, white as death.

"That you shall see."