One of the stenographers in the office, Miss Betty Blackwell, who acted as private secretary to Mr. Langhorne, is missing and the case has already attracted wide attention. Whether or not her disappearance had anything to do with the robbery is not known.
"Naturally he would not report it to the police," commented Kennedy; "that is, if it had anything to do with that Black Book, as I am sure that it must have had."
"It was certainly a most peculiar affair if it did not," I remarked.
"There must be some way of finding that out. It's strange about Betty
Blackwell."
Kennedy was turning something over in his mind. "Of course," he remarked, "we don't want to come out into the open just yet, but it would be interesting to know what happened down there at Langhorne's. Have you any objection to going down with me and posing as a reporter from the Star?"
"None whatever," I returned.
We stopped at the laboratory on the campus of the University where Craig still retained his professorship. Kennedy secured a rather bulky piece of apparatus, which, as nearly as I can describe, consisted of a steel frame, which could be attached by screws to any wooden table. It contained a lower plate which could move forward and back, two lateral uprights stiffened by curved braces, and a cross piece of steel attached by strong bolts to the tops of the posts. In the face of the machine was a dial with a pointer.
Kennedy quickly took the apparatus apart and made it up into two packages so that between us we could carry it easily, and at about the time that Wall Street offices were opening we were on our way downtown.
Langhorne proved to be a tall, rather slim, man of what might be called youngish middle age. One did not have to be introduced to him to read his character or his occupation. Every line of his faultlessly fitting clothes and every expression of his keen and carefully cared-for face betokened the plunger, the man who lived by his wits and found the process both fascinating and congenial.
"Mr. Langhorne," began Kennedy, after I had taken upon myself the duty of introducing ourselves as reporters, "we are preparing an article for our paper about a new apparatus which the Star has imported especially from Paris. It is a machine invented by Monsieur Bertillon just before he died, for the purpose of furnishing exact measurements of the muscular efforts exerted in the violent entry of a door or desk by making it possible to reproduce the traces of the work that a burglar has left on doors and articles of furniture. We've been waiting for a case that the instrument would fit into and it seemed to us that perhaps it might be of some use to you in getting at the real robber of your office. Would you mind if we made an attempt to apply it?"
Langhorne could not very well refuse to allow us to try the thing, though it was plainly evident that he did not want to talk and did not relish the publicity that the news of the morning had brought him.