He followed Fall along the corridor, and the doctor opened a small door and illuminated a tiny lift inside, and Poltavo stepped in. As he did so the door clicked.

"How do I work this lift?" he asked through the ornamental ironwork of the doorway.

"I work it from outside," said Dr. Fall, cheerfully, and pressed a button. The lift sank. It passed one steel door—that was the first floor; and another—that was the ground floor, but still the lift did not stop. It went on falling slowly, evenly, without jar or haste, and suddenly it came to a stop before a door made of a number of thin steel bars placed horizontally. As the lift stopped, the steel-barred doorway opened noiselessly. All Poltavo's senses were now alert; he, a past master in the art of treachery, had been at last its victim. He did not leave the tiny lift for a moment, but prepared for eventualities. He took a pencil out of his pocket and wrote rapidly on the wooden panelling of the elevator, and then he stepped out into the semi-darkness. He saw a large apartment, a bed and chair, and above a large table one dim light. A number of switches on the wall facing him promised further illumination. Anyway, if the worst came to the worst, he could find a way by the lift well to safety again. He searched his pockets with feverish haste. He usually carried one or two pistol cartridges in case of necessity, and he was rewarded, for, in his top waistcoat pocket, he discovered two nickel-pointed shapes. Hastily he removed the dummy magazine from the butt of his pistol. The removal of the magazine must have been effected by his servant, and the servant, now he came to give the matter consideration, was possibly in the pay of Farrington, and had probably warned the occupants of the Secret House of Poltavo's departure.

It was but natural that the big man would take no chances, and Poltavo cursed himself for a fool for allowing himself to be lured into a sense of security. He stepped out of the lift; there was enough light to guide him across the room. He reached the switchboard and pulled one of the little levers. Three lights appeared at the far end of the room; he pulled over the rest and the room was brilliantly illuminated.

It was an underground chamber, with red, distempered walls, artistically furnished. The small bed in the corner was of brass; the air was conveyed to his gloomy chamber by means of ventilators placed at intervals in the wall.

Not an uncomfortable prison, thought Poltavo. He was making his inspection when he heard a clang, and swung round. The steel door of the lift had closed and he reached it just in time to see the floor of the little cage ascending out of sight. He cursed himself again for his insensate folly; he might have fixed the door with a chair; it was an elementary precaution to take, but he had not realized the possibilities of this house of mystery.

Perhaps the chairs were fixed. He tried them, but found he was mistaken, except in one case. The great chair at the head of the table, solid and heavy, was immovable, for it was clamped to the floor.

In one corner was a framework, and he guessed it to be the slide in which the small provision lift ran.

His surmise was accurate, for even while he was examining it, a trap opened in the ceiling, and there slid down noiselessly between the oiled grids a tiny platform on which was a tray filled with covered dishes. He lifted the viands from the little elevator to the table and inspected them. There was a note written in pencil.