was not as it should be. Those elevators—they were seldom out of order. Perhaps. . . .
But, panting a little from his climb, he found his floor, and the door of his private office.
For just a split second he hesitated; then, unlocking the door, he flung it wide and went in.
And then, for the third time that evening, he had another shock: for, almost from the moment of his entry into that sound-proofed chamber, he knew that he was not alone.
For a moment, there in the blaze from the electrolier, lighted by the opening of the door, he stood rigid, listening, holding his breath; crouched, bent forward like a sprinter upon his mark.
Quarrier was a big man, and well muscled; in his day he had been an amateur boxer of repute. For a big man, he was quick, well-poised, supple and controlled.
A brain of ice and nerves of steel—that was Quarrier. And at that moment he stood in need of them.
He had heard nothing, felt nothing, seen nobody—and yet he knew beyond any possibility of doubt, that someone or something was with him there in that sound-proof chamber, thirty stories above the street. And the knowledge—as certain as the fact that he, Quarrier, as yet lived and breathed—the knowledge that he was not alone was not reasurring. It was fantastic, it was incredible—but it was true!
Everything in that private office was in plain sight; shelter there was none for any possible intruder; and yet, by the very positive evidence of his eyes he knew, and his pulses quickened at the thought, that he was not alone.
It had been Quarrier's fancy to rent the small suite on the top floor of the out-of-the-way office building. He liked the view; the rooms were remote; they suited his purpose; they were private. Anything could happen here, and no one be the wiser; the crash of a heavy .45, for instance, would not penetrate an inch outward beyond those sound-proof walls. And a cry, a shout, would be lost there just as a stone is lost, dropped downward into a deep well of silence—and of oblivion.
Now, if Quarrier's man, Harrison, a soft-footed, super-efficient body-servant had not kept on his hat; or if, say, he had not had a particularly abundant shock of hair, added to the fact that although an excellent servant, he was somewhat deaf; and if, too, he had not for once, walked and worked in deviousness—this chronicle would have had a very different ending—for Quarrier, at any rate.
His hand in the pocket of his coat, the fingers curled about the butt of the automatic that he had taken from the guard back there in the cellar, Quarrier, frowning, surveyed the room in a slow, searching appraisal. Those documents—he had to make certain of them.
From left to right, as his gaze went round the chamber, he saw a book-case, a full-length canvas, done in oils, the double windows, a door, locked with a huge, old-fashioned key, leading into a lumber-room just beyond, a small wall safe, his desk—which completed the circle.
The room was in itself a safe. It was like a fort: The windows were protected by sheet-steel aprons similar to the burglar-guards used by bank tellers; the main entrance door, through which Quarrier had entered, and which opened upon the corridor and the elevators, was of steel, with a patent spring combination lock; the other door, leading to the lumber-room, was also of steel, locked, however, with a huge, old-fashioned key, but this latter door had never been in use, since Quarrier's occupancy.
Nothing short of an acetylene blow-pipe could have penetrated the walls, the ceiling, the floor, but they were smooth, unmarred by scratch or tell-tale stain.
Now, to understand events as they occurred:
Quarrier was in his private sanctum, his office; it adjoined the lumber-room
