"A STOCKHOLDER."

"Well?" demanded Kennedy, looking up.

"That can have only one meaning," a.s.serted Denison.

"What is that?" inquired Kennedy coolly, as if to confirm his own interpretation.

"Why, another robbery--here in New York, of course."

"But who would do it?" I asked.

"Who?" repeated Denison. "Some one representing that European combine, of course. That is only part of the Trust method--ruin of compet.i.tors whom they cannot absorb."

"Then you have refused to go into the combine? You know who is backing it?"

"No--no," admitted Denison reluctantly. "We have only signified our intent to go it alone, as often as anyone either with or without authority has offered to buy us out. No, I do not even know who the people are. They never act in the open. The only hints I have ever received were through perfectly reputable brokers acting for others."

"Does Haughton know of this note?" asked Kennedy.

"Yes. As soon as I received it, I called him up."

"What did he say?"

"He said to disregard it. But--you know what condition he is in. I don't know what to do, whether to surround the office by a squad of detectives or remove the radium to a regular safety deposit vault, even at the loss of the emanation. Haughton has left it to me."

Suddenly the thought flashed across my mind that perhaps Haughton could act in this uninterested fashion because he had no fear of ruin either way. Might he not be playing a game with the combination in which he had protected himself so that he would win, no matter what happened?

"What shall I do?" asked Denison. "It is getting late."

"Neither," decided Kennedy.

Denison shook his head. "No," he said, "I shall have some one watch there, anyhow."

CHAPTER XV

THE ASPHYXIATING SAFE

Denison had scarcely gone to arrange for some one to watch the office that night, when Kennedy, having gathered up his radioscope and packed into a parcel a few other things from various cabinets, announced: "Walter, I must see that Miss Wallace, right away. Denison has already given me her address. Call a cab while I finish clearing up here. I don't like the looks of this thing, even if Haughton does neglect it."

We found Miss Wallace at a modest boarding-house in an old but still respectable part of the city. She was a very pretty girl, of the slender type, rather a business woman than one given much to amus.e.m.e.nt.

She had been ill and was still ill. That was evident from the solicitous way in which the motherly landlady scrutinized two strange callers.

Kennedy presented a card from Denison, and she came down to the parlor to see us.

"Miss Wallace," began Kennedy, "I know it is almost cruel to trouble you when you are not feeling like office work, but since the robbery of the safe at Pittsburgh, there have been threats of a robbery of the New York office."

She started involuntarily, and it was evident, I thought, that she was in a very high-strung state.

"Oh," she cried, "why, the loss means ruin to Mr. Denison!"

There were genuine tears in her eyes as she said it.

"I thought you would be willing to aid us," pursued Kennedy sympathetically. "Now, for one thing, I want to be perfectly sure just how much radium the Corporation owns, or rather owned before the first robbery."

"The books will show it," she said simply.

"They will?" commented Kennedy. "Then if you will explain to me briefly just the system you used in keeping account of it, perhaps I need not trouble you any more."

"I'll go down there with you," she answered bravely. "I'm better to-day, anyhow, I think."

She had risen, but it was evident that she was not as strong as she wanted us to think.

"The least I can do is to make it as easy as possible by going in a car," remarked Kennedy, following her into the hall where there was a telephone.

The hallway was perfectly dark, yet as she preceded us I could see that the diamond pin which held her collar in the back sparkled as if a lighted candle had been brought near it. I had noticed in the parlor that she wore a handsome tortoisesh.e.l.l comb set with what I thought were other brilliants, but when I looked I saw now that there was not the same sparkle to the comb which held her dark hair in a soft ma.s.s. I noticed these little things at the time, not because I thought they had any importance, but merely by chance, wondering at the sparkle of the one diamond which had caught my eye.

"What do you make of her?" I asked as Kennedy finished telephoning.

"A very charming and capable girl," he answered noncommittally.

"Did you notice how that diamond in her neck sparkled?" I asked quickly.

He nodded. Evidently it had attracted his attention, too.

"What makes it?" I pursued.

"Well, you know radium rays will make a diamond fluoresce in the dark."

"Yes," I objected, "but how about those in the comb?"

"Paste, probably," he answered tersely, as we heard her foot on the landing. "The rays won't affect paste."

It was indeed a shame to take advantage of Miss Wallace's loyalty to Denison, but she was so game about it that I knew only the utmost necessity on Kennedy's part would have prompted him to do it. She had a key to the office so that it was not necessary to wait for Denison, if indeed we could have found him.

Together she and Kennedy went over the records. It seemed that there were in the safe twenty-five platinum tubes of one hundred milligrams each, and that there had been twelve of the same amount at Pittsburgh.

Little as it seemed in weight it represented a fabulous fortune.

"You have not the combination?" inquired Kennedy.

"No. Only Mr. Denison has that. What are you going to do to protect the safe to-night?" she asked.

"Nothing especially," evaded Kennedy.

"Nothing?" she repeated in amazement.