"There is a switch here," said T. B.

He pulled it down and a small lamp glowed, illuminating a tiny lift cage.

"And here I presume are the necessary controlling b.u.t.tons," said T. B., pointing to a number of white discs; "we will try this one."

He pressed the b.u.t.ton and instantly the cage began to fall. It came to a standstill after a while and the men stepped out.

"Part of the old working," said T. B.; "a very ingenious idea."

He flashed his lamp over the walls to find the electrical connection.

They were here, as they were at the other end, perfectly accessible. An instant later the long corridor was lighted up.

"By heavens," said T. B. admiringly, "they have even got an underground tramway; look here!"

At this tiny terminus there were two branches of rails and a car was in waiting. A few minutes later T. B. Smith had reached the other end of the mine gallery and was seeking the second elevator.

"Here we are," he said--"everything run by electricity. I thought that power house of Farrington's had a pretty stiff job, and now I see how heavy is the load which it has to carry. Step carefully into this," he continued, "and make a careful note of the way we are going. I think we must be about a hundred feet below the level of the earth; just gauge it roughly as we go up. Here we go."

He pressed a b.u.t.ton and up went the lift. They pa.s.sed out of the little mine chamber, carefully propping back the swing door, and made their way along the corridor.

"This looks like an apartment," said T. B., as he stopped before a red-painted steel door in one of the walls. He pressed it gently, but it did not yield. He made a further examination, but there was no keyhole visible.

"This is either worked by a hidden spring or it does not work at all,"

he said in a low voice.

"If it is a spring," said Ela, "I will find it."

His sensitive hands went up and down the surface of the door and presently they stopped.

"There is something which is little larger than a pin hole," he said. He took from his pocket a general utility knife and slipped out a thin steel needle. "Pipe cleaners may be very useful," he said, and pressed the long slender bodkin into the aperture. Instantly, and without sound, the door opened.

T. B. was the first to go in, revolver in hand. He found himself in a room which, even if it were a prison, was a well-disguised prison. The walls were hung with costly tapestry, the carpet under foot was thick and velvety and the furniture which garnished the room was of a most costly and luxurious description.

"Lady Constance!" gasped T. B. in surprise.

A woman who was sitting in a chair near the reading lamp rose quickly and turned her startled gaze to the detective.

"Mr. Smith," she said, and ran towards him. "Oh, thank G.o.d you have come!"

She grasped him by his two arms; she was half hysterical in that moment of her release, and was babbling an incoherent string of words; a description of her capture--her fear--her grat.i.tude--all in an inextricably confused rush of half completed phrases.

"Sit down, Lady Constance," said T. B. gently; "collect yourself and try to remember--have you seen Poltavo?"

"Poltavo?" she said, startled into coherence. "No, is he here?"

"He is somewhere here," said T. B. "I am seeking for him now. Will you stay here or will you come with us?"

"I would rather come with you," she said with a shiver.

They pa.s.sed through the door together.

"Do all these doors open upon rooms similar to this?" asked T. B.

"I believe there are a number of underground cells," she answered in a whisper, "but the princ.i.p.al one is that which is near." She pointed to a red-painted door some twenty paces away from the one from which they were emerging. There was another pause whilst Ela repeated his examination of the door.

Apparently they all worked on the pick system, a method which medieval conspirators favoured, and which the Italian workmen probably imported from the land of their birth; a land which has given the world the Borgias and the Medicis and the Visconti.

"Stay here," said T. B. in a low voice, and Lady Constance shrank back against the wall.

Ela pressed in his little needle and again the result was satisfactory.

The door opened slowly and T. B. stepped in.

He stood for a moment trying to understand all that the terrible scene signified. The limp body on the floor; the two remorseless men standing close by; Farrington with folded arms and his eye glowering down upon the dead man at his feet. Fall at the switchboard.

Then T. B.'s revolver rose swiftly.

"Hands up!" he said.

The words were hardly out of his mouth when the room was plunged in darkness, his companion was flung violently backward as the electrical control came into operation and the door slammed in Ela's face. He pressed it without avail. He brought to his aid the little needle, but this time the lock would not move.

Ela's face went chalk white.

"My G.o.d!" he gasped, "they've got T. B.!"

He stood for a moment in indecision. He had visualized the scene and knew what fate would befall his chief.

"Back to the gallery," he said harshly, and led the way, holding the woman's arm in support. He found his way without difficulty to the lift, sprang into it, after Lady Constance, and pressed the b.u.t.ton.... Now they were speeding along the sparking rail ... now they were in the lift rising swiftly to the room in Moor Cottage. T. B.'s car was outside.

"You had better come with me," said Ela quickly.

Lady Constance jumped into the car after him.

"To the Secret House," said Ela to the chauffeur, and as the car drove forward he turned to the woman at his side.

"I will put you amongst your friends in a few moments," he said; "at present I dare not risk the loss of a second."

"But what will they do?"

"I pretty well know what they will do," said Ela grimly. "Farrington is playing his last hand, and T. B. Smith is to be his last victim."

In the darkness of the underground chamber T. B. faced his enemies, striving to pierce the gloom, his finger in position upon the delicate trigger of his automatic pistol.

"Do not move," he said softly; "I will shoot without any hesitation."

"There is no need to shoot," said the suave voice of the doctor; "the lights went out, quite by accident, I a.s.sure you, and you and your friends have no need to fear."

T. B. groped his way along the wall, his revolver extended. In the gloom he felt rather than saw the bulky figure of the doctor and reached out his hand gingerly.