Three hairpins and a linen handkerchief held a watch-case receiver close over her ear, after the style of the metallic ear-bands of a central-office operator. Leading from this improvised ear-band and trailing across the floor out into her private room at the back, ran a green cloth-covered wire. This wire connected again with an innocent-looking and ordinary desk-battery transmitter, rigged up with a lever switch, and standing on a little table next to the wall, up which might be detected the two bimetallic wires which, since ten o’clock that morning, tapped and bridged the general wire connecting the offices of Ottenheimer & Company with the outside world.

From time to time the members of that firm went to their telephone, little dreaming that a young lady, decorously sewing velvet scissors-cases on a studio top-floor of another building, was quietly listening to every message that passed in and out of their bustling place of business. It was a strange medley of talk, some of it incoherent, some of it dull, some of it amusing. Sometimes the busy needle was held poised, and a more interested and startled expression flitted over the shadowy violet eyes of Miss Cecelia Starr. At such times she vaguely felt that she was a disembodied spirit, listening to the hum of a far-away world, or, at other times, that she was an old astrologer, gazing into some mystic and forbidden crystal. Still again, as she listened, she felt like a veritable eagle, invisible, poised high in ethereal emptiness, watching hungrily a dim and far-off sign of earthly life and movement.

Suddenly, from the street door sounded the familiar two-three ring of Durkin. This door remained open during the day, and she waited for him to come up. She went to her own door, however, and laughed girlishly as he stepped into the room, mopping his moist forehead. There was a very alert, nervous, triumphant expression in his eyes, and once again the feeling swept over her that it was now crime, and crime alone, that could stimulate into interest and still satisfy their fagged vitalities. It was their one and only intoxication, the one thing that could awaken them from their mental sloth and stir them from life’s shadowy valley of disillusionment.

Her quick eye had taken note of the fact that he wore a soiled blue uniform, and the leather-peaked blue cap of a Consolidated Gas Company employee, and that he carried with him a brass hand-pump. He laughed a little to himself, put down his pump in one corner of the room, and allowed his fingers to stray through his mutilated Vandyke, now a short and straggly growth of sandy whiskers. Then he turned to her with an unuttered query on his face.

“I was right,” she said quietly, but hurriedly.

“I never really doubted it!”

“Ottenheimer has a private drawer in the vault. It’s in that. His wife telephoned down very cautiously about it this morning. A little later, too, Ottenheimer was called up from a Brooklyn drugstore, by a Mrs. Van Gottschalk, or some such name, who said her husband was still in bed with the grip, and couldn’t possibly get over until Monday. This man, you see, is Ottenheimer’s diamond-cutter.”

“Thank heaven, that gives us a little more time!”

“Three days, at least! But what have you done, Jim?”

“Been trying to persuade the janitor of the Ottenheimer Building that I was sent to pump the water out of his gas-pipes,—but he was just as sure that I wasn’t. I got down in his cellar, though, and had a good look about, before I saw it wouldn’t do to push the thing too far. So I insisted on going up and seeing the owner about that order. There was an inside stairway, and a queer-looking steel door I wanted to get my knuckles against. I started up there, but he hauled me back. I found out, though, that this door is made of one-inch steel armor-plate. There’s another door leading from the foot of the outer hallway into the cellar itself. But that’s only covered with soft sheet-iron—more against fire than anything else. Fifteen minutes will get through that one, easily. It’s the inner door that is the problem. I tried it with a knife-point, just one hard little jab. It took the end off my Roger’s blade.”