"What of that?" I asked, wondering why he was changing the subject so abruptly.

"Why, only this," he replied. "I have been reading about wireless a good deal lately, and if the theories of some scientists are correct, the wireless age is not without its dangers as well as its wonders. I recall reading not long ago of a German professor who says there is no essential difference between wireless waves and the X-rays, and we know the terrible physical effects of X-rays. I believe he estimated that only one three hundred millionth part of the electrical energy generated by sending a message from one station to another near by is actually used up in transmitting the message. The rest is dispersed in the atmosphere. There must be a good deal of such stray electrical energy about Seaville. Isn't it possible that it might hit some one somewhere who was susceptible?"

Kennedy said nothing. Waldon's was at least a novel idea, whether it was plausible or not. The only way to test it out, as far as I could determine, was to see whether it fitted with the facts after a careful investigation of the case itself.

It was still early in the day and the trains were not as crowded as they would be later. Consequently our journey was comfortable enough and we found ourselves at last at the little vine-covered station at Seaville.

One could almost feel that the gay summer colony was in a state of subdued excitement. As we left the quaint station and walked down the main street to the town wharf where we expected some one would be waiting for us, it seemed as if the mysterious disappearance of the beautiful Mrs. Edwards had put a damper on the life of the place. In the hotels there were knots of people evidently discussing the affair, for as we pa.s.sed we could tell by their faces that they recognized us.

One or two bowed and would have joined us, if Waldon had given any encouragement. But he did not stop, and we kept on down the street quickly.

I myself began to feel the spell of mystery about the case as I had not felt it among the distractions of the city. Perhaps I imagined it, but there even seemed to be something strange about the houseboat which we could descry at anchor far down the bay as we approached the wharf.

We were met, as Waldon had arranged, by a high-powered runabout, the tender to his own yacht, a slim little craft of mahogany and bra.s.s, driven like an automobile, and capable of perhaps twenty-five or thirty miles an hour. We jumped in and were soon skimming over the waters of the bay like a skipping stone.

It was evident that Waldon was much relieved at having been able to bring a.s.sistance, in which he had as much confidence as he reposed in Kennedy. At any rate it was something to be nearing the scene of action again.

The Lucie was perhaps seventy feet long and a most attractive craft, with a hull yachty in appearance and of a type which could safely make long runs along the coast, a stanch, seaworthy boat, of course without the speed of the regularly designed yacht, but more than making up in comfort for those on board what was lost in that way. Waldon pointed out with obvious pride his own trim yacht swinging gracefully at anchor a half mile or so away.

As we approached the houseboat I looked her over carefully. One of the first things I noticed was that there rose from the roof the primitive inverted V aerial of a wireless telegraph. I thought immediately of the unfinished letter and its contents, and shaded my eyes as I took a good look at the powerful transatlantic station on the spit of sand perhaps three or four miles distant, with its tall steel masts of the latest inverted L type and the cl.u.s.ter of little houses below, in which the operators and the plant were.

Waldon noticed what I was looking at, and remarked, "It's a wonderful station--and well worth a visit, if you have the time--one of the most powerful on the coast, I understand."

"How did the Lucie come to be equipped with wireless?" asked Craig quickly. "It's a little unusual for a private boat."

"Mr. Edwards had it done when she was built," explained Waldon. "His idea was to use it to keep in touch with the stock market on trips."

"And it has proved effective?" asked Craig.

"Oh, yes--that is, it was all right last winter when he went on a short cruise down in Florida. This summer he hasn't been on the boat long enough to use it much."

"Who operates it?"

"He used to hire a licensed operator, although I believe the engineer, Pedersen, understands the thing pretty well and could use it if necessary."

"Do you think it was Pedersen who used it for Mrs. Edwards?" asked Kennedy.

"I really don't know," confessed Waldon. "Pedersen denies absolutely that he has touched the thing for weeks. I want you to quiz him. I wasn't able to get him to admit a thing."

CHAPTER VIII

THE HOUSEBOAT MYSTERY

We had by this time swung around to the side of the houseboat. I realized as we mounted the ladder that the marine gasoline engine had materially changed the old-time houseboat from a mere scow or barge with a low flat house on it, moored in a bay or river, and only with difficulty and expense towed from one place to another. Now the houseboat was really a fair-sized yacht.

The Lucie was built high in order to give plenty of accommodation for the living quarters. The staterooms, dining rooms and saloon were really rooms, with seven or eight feet of head room, and furnished just as one would find in a tasteful and expensive house.

Down in the hull, of course, was the gasoline motor which drove the propeller, so that when the owner wanted a change of scene all that was necessary was to get up anchor, start the motor and navigate the yacht-houseboat to some other harbor.

Edwards himself met us on the deck. He was a tall man, with a red face, a man of action, of outdoor life, apparently a hard worker and a hard player. It was quite evident that he had been waiting for the return of Waldon anxiously.

"You find us considerably upset, Professor Kennedy," he greeted Craig, as his brother-in-law introduced us.

Edwards turned and led the way toward the saloon. As he entered and bade us be seated in the costly cushioned wicker chairs I noticed how sumptuously it was furnished, and particularly its mechanical piano, its phonograph and the splendid hardwood floor which seemed to invite one to dance in the cool breeze that floated across from one set of open windows to the other. And yet in spite of everything, there was that indefinable air of something lacking, as in a house from which the woman is gone.

"You were not here last night, I understand," remarked Kennedy, taking in the room at a glance.

"Unfortunately, no," replied Edwards, "Business has kept me with my nose pretty close to the grindstone this summer. Waldon called me up in the middle of the night, however, and I started down in my car, which enabled me to get here before the first train. I haven't been able to do a thing since I got here except just wait--wait--wait. I confess that I don't know what else to do. Waldon seemed to think we ought to have some one down here--and I guess he was right. Anyhow, I'm glad to see you."

I watched Edwards keenly. For the first time I realized that I had neglected to ask Waldon whether he had seen the unfinished letter. The question was unnecessary. It was evident that he had not.

"Let me see, Waldon, if I've got this thing straight," Edwards went on, pacing restlessly up and down the saloon. "Correct me if I haven't.

Last night, as I understand it, there was a sort of little family party here, you and Miss Verrall and your mother from the Nautilus, and Mrs.

Edwards and Dr. Jermyn."

"Yes," replied Waldon with, I thought, a touch of defiance at the words "family party." He paused as if he would have added that the Nautilus would have been more congenial, anyhow, then added, "We danced a little bit, all except Lucie. She said she wasn't feeling any too well."

Edwards had paused by the door. "If you'll excuse me a minute," he said, "I'll call Jermyn and Mrs. Edwards' maid, Juanita. You ought to go over the whole thing immediately, Professor Kennedy."

"Why didn't you say anything about the letter to him?" asked Kennedy under his breath.

"What was the use?" returned Waldon. "I didn't know how he'd take it.

Besides, I wanted your advice on the whole thing. Do you want to show it to him?"

"Perhaps it's just as well," ruminated Kennedy. "It may be possible to clear the thing up without involving anybody's name. At any rate, some one is coming down the pa.s.sage this way."

Edwards entered with Dr. Jermyn, a clean-shaven man, youthful in appearance, yet approaching middle age. I had heard of him before. He had studied several years abroad and had gained considerable reputation since his return to America.

Dr. Jermyn shook hands with us cordially enough, made some pa.s.sing comment on the tragedy, and stood evidently waiting for us to disclose our hands.

"You have been Mrs. Edwards' physician for some time, I believe?"

queried Kennedy, fencing for an opening.

"Only since her marriage," replied the doctor briefly.

"She hadn't been feeling well for several days, had she?" ventured Kennedy again.

"No," replied Dr. Jermyn quickly. "I doubt whether I can add much to what you already know. I suppose Mr. Waldon has told you about her illness. The fact is, I suppose her maid Juanita will be able to tell you really more than I can."

I could not help feeling that Dr. Jermyn showed a great deal of reluctance in talking.

"You have been with her several days, though, haven't you?"

"Four days, I think. She was complaining of feeling nervous and telegraphed me to come down here. I came prepared to stay over night, but Mr. Edwards happened to run down that day, too, and he asked me if I wouldn't remain longer. My practice in the summer is such that I can easily leave it with my a.s.sistant in the city, so I agreed. Really, that is about all I can say. I don't know yet what was the matter with Mrs. Edwards, aside from the nervousness which seemed to be of some time standing."