He went directly to the desk and with well-manicured finger, scarcely reminiscent of a fisherman, began tracing the names down the list until he stopped before one which read:

Marcius Del Mar and valet. Washington, D. C. Room 520.

With a quick glance about, he made a note of it, and turned away, leaving the La Coste to take up quarters of his own in the Prince Henry down the street.

Not until Del Mar had left with his two policemen did the fussy old gentleman reappear in the La Coste. Then he rode up to Del Mar's room and rapped at the door.

"Is Mr. Del Mar in?" he inquired of the valet.

"No, sir," replied that functionary.

The little old man appeared to consider, standing a moment dandling his silk hat. Absent-mindedly he dropped it. As the valet stooped to pick it up, the old gentleman exhibited an agility and strength scarcely to be expected of his years. He seized the valet, while with one foot he kicked the door shut.

Before the surprised servant knew what was going on, his a.s.sailant had whipped from his pocket a handkerchief in which was concealed a thin tube of anesthetic. Then leaving the valet p.r.o.ne in a corner with the handkerchief over his face, he proceeded to make a systematic search of the rooms, opening all drawers, trunks and bags.

He turned pretty nearly everything upside down, then started on the desk. Suddenly he paused. There was a paper. He read it, then with an air of extreme elation shoved it into his pocket.

As he was going out he stopped beside the valet, removed the handkerchief from his face and bound him with a cord from the portieres. Then, still immaculate in spite of his encounter, he descended in the elevator, reentered a waiting car and drove off.

Quite evidently, however, he wanted to cover his tracks for he had not gone a half dozen blocks before he stopped, paid and tipped the driver generously, and disappeared into the theatre crowd.

Back again in the Prince Henry, whither the fussy little old man made his way as quickly as he could through a side street, he went quietly up to his room.

His door was now locked. He did not have to deny himself to visitors, for he had none. Still, his room was cluttered by a vast amount of paraphernalia and he was seated before a table deep in work.

First of all he tied a handkerchief over his nose and mouth. Then he took up a cartridge from the table and carefully extracted the bullet.

Into the s.p.a.ce occupied by the bullet he poured a white powder and added a wad of paper, like a blank cartridge, placing the cartridge in the chamber of a revolver and repeating the operation until he had it fully loaded. It was his own invention of an asphyxiating bullet.

Perhaps half an hour later, the old gentleman, his room cleaned up and his immaculate appearance restored, sauntered forth from the hotel down the street like a veritable Turveydrop, to show himself.

Elaine seemed quite impressed with our new friend, Del Mar, as we made our way to the library, though I am not sure but that it was a pose on her part. At any rate he seemed quite eager to help us.

"What do you suppose has become of Mr. Kennedy?" asked Elaine.

Del Mar looked at her earnestly. "I should be glad to search for him,"

he returned quickly. "He was the greatest man in our profession. But first I must execute the commission of the Secret Service. We must find his torpedo model before it falls into foreign hands."

We talked for a few moments, then Del Mar with a glance at his watch excused himself. We accompanied him to the door, for he was indeed a charming man. I felt that, if in fact he were a.s.signed to the case, I ought to know him better.

"If you're going down-town," I ventured, "I might accompany you part of the way."

"Delighted," agreed Del Mar.

Elaine gave him her hand and he took it in such a deferential way that one could not help liking him. Elaine was much impressed.

As Del Mar and I walked down the avenue, he kept up a running fire of conversation until at last we came near the La Coste.

"Charmed to have met you, Mr. Jameson," he said, pausing. "We shall see a great deal of each other I hope."

I had not yet had time to say good-bye myself when a slight exclamation at my side startled me. Turning suddenly, I saw a very brisk, fussy old gentleman who had evidently been hurrying through the crowd. He had slipped on something on the sidewalk and lost his balance, falling near us.

We bent over and a.s.sisted him to his feet. As I took hold of his hand, I felt a peculiar pressure from him. He had placed something in my hand. My mind worked quickly. I checked my first impulse to speak and, more from curiosity than anything else, kept the thing he had pa.s.sed to me surrept.i.tiously.

"Thank you, gentlemen," he puffed, straightening himself out. "One of the infirmities of age. Thank you, thank you."

In a moment he had bustled off quite comically.

Again Del Mar said good-bye and I did not urge him to stay. He had scarcely gone when I looked at the thing the old man had placed in my hand. It was a little folded piece of paper. I opened it slowly. Inside was printed in pencil, disguised:

"BE CAREFUL. WATCH HIM."

I read it in amazement. What did it mean?

At the La Coste, Del Mar was met by two of his men in the lobby and they rode up to his room.

Imagine their surprise when they opened the door and found the valet lying bound on the floor.

"Who the deuce did this?" demanded Del Mar as they loosened him.

The valet rose weakly to his feet. "A little old man with gray whiskers," he managed to gasp.

Del Mar looked at him in surprise. Instantly his active mind recalled the little old man who had fallen before us on the street.

Who--what was he?

"Come," he said quickly, beckoning his two companions who had come in with him.

Some time later, Del Mar's car stopped just below the Dodge house.

"You men go around back of the house and watch," ordered Del Mar.

As they disappeared he turned and went up the Dodge steps.

I walked back after my strange experience with the fussy little old gentleman, feeling more than ever, now that Craig was gone, that both Elaine and Aunt Josephine needed me.

As we sat talking in the library, Rusty, released from the chain on which Jennings kept him, bounded with a rush into the library.

"Good old fellow," encouraged Elaine, patting him.

Just then Jennings entered and a moment later was followed by Del Mar, who bowed as we welcomed him.

"Do you know," he began, "I believe that the lost torpedo model is somewhere in this house and I have reason to antic.i.p.ate another attempt of foreign agents to find it. If you'll pardon me, I've taken the liberty of surrounding the place with some men we can trust."