"No more than another, said he. "Except for what Doris felt compelled to tell me, I know as little as yourself. Mr. Brotherson's delirium took the form of calling continually upon one name. I did not know this name, but Doris did, also the danger lurking in the fact that he had yet to hear of the tragedy which had robbed him of this woman to whom he was so deeply attached. So she told me just this much. That the Edith whose name rung so continuously in our ears was no other than the Miss Challoner of New York of whose death and its tragic circumstances the papers have been full; that their engagement was a secret one unshared so far as she knew by any one but herself. That she begged me to preserve this secret and to give her all the help I could when the time came for him to ask questions. Especially did she entreat me to be with her at the crisis. I was, but his waking was quite natural. He did not ask for Miss Challoner; he only inquired how long he had been ill and whether Doris had received a letter during that time. She had not received one, a fact which seemed to disappoint him; but she carried it off so gaily (she is a wonderful girl, Mr. Sweetwater - the darling of all our hearts), saying that he must not be so egotistical as to think that the news of his illness had gone beyond Derby, that he soon recovered his spirits and became a very promising convalescent. That is all I know about the matter; little more, I take it, than you know yourself.

Sweetwater nodded; he had expected nothing from the doctor, and was not disappointed at his failure. There were two strings to his bow, and the one proving valueless, he proceeded to test the other.

"You have mentioned Miss Scott, as the confidante - and only confidante of this unhappy pair, said he. "Would it be possible - can you make it possible for me to see her?

It was a daring proposition; he understood this at once from the doctor's expression; and, fearing a hasty rebuff, he proceeded to supplement his request with a few added arguments, urged with such unexpected address and show of reason that Dr. Fenton's aspect visibly softened and in the end he found himself ready to promise that he would do what he could to secure his visitor the interview he desired if he would come to the house the next day at the time of his own morning visit.

This was as much as the young detective could expect, and having expressed his thanks, he took his leave in anything but a discontented frame of mind. With so powerful an advocate as the doctor, he felt confident that he should soon be able to conquer this young girl's reticence and learn all that was to be learned from any one but Mr. Brotherson himself. In the time which must elapse between that happy hour and the present, he would circulate and learn what he could about the prospective manager. But he soon found that he could not enter the Works without a permit, and this he was hardly in a position to demand; so he strolled about the village instead, and later wandered away into the forest.

Struck by the inviting aspect of a narrow and little used road opening from the highway shortly above the house where his interests were just then centred, he strolled into the heart of the spring woods till he came to a depression where a surprise awaited him, in the shape of a peculiar structure rising from its midst where it just fitted, or so nearly fitted that one could hardly walk about it without brushing the surrounding tree trunks. Of an oval shape, with its door facing the approach, it nestled there, a wonder to the eye and the occasion of considerable speculation to his inquiring mind. It had not been long built, as was shown very plainly by the fresh appearance of the unpainted boards of which it was constructed; and while it boasted of a door, as I've already said, there were no evidences visible of any other break in the smooth, neatly finished walls. A wooden ellipse with a roof but no windows; such it appeared and such it proved to be. A mystery to Sweetwater's eyes, and like all mysteries, interesting. For what purpose had it been built and why this isolation? It was too flimsy for a reservoir and too expensive for the wild freak of a crank.

A nearer view increased his curiosity, In the projection of the roof over the curving sides he found fresh food for inquiry. As he examined it in the walk he made around the whole structure, he came to a place where something like a hinge became visible and further on another. The roof was not simply a roof; it was also a lid capable of being raised for the air and light which the lack of windows necessitated. This was an odd discovery indeed, giving to the uncanny structure the appearance of a huge box, the cover of which could be raised or lowered at pleasure. And again he asked himself for what it could be intended? What enterprise, even of the great Works, could demand a secrecy so absolute that such pains as these should be taken to shut out all possibility of a prying eye. Nothing in his experience supplied him with an answer.

He was still looking up at these hinges, with glance which took in at the same time the nearness and extreme height of the trees by which this sylvan mystery was surrounded, when a sound from the road on the opposite side of the hollow brought his conjectures to a standstill and sent him hurrying on to the nearest point from which that road became visible. A team was approaching. He could hear the heavy tread of horses working their laborious way through trees whose obstructing branches swished before and behind them. They were bringing in a load for this shed, whose uses he would consequently soon understand. Grateful for his good luck - for his was a curiosity which could not stand defeat - he took a few steps into the wood, and from the vantage point of a concealing cluster of bushes, fixed his eyes upon the spot where the road opened into the hollow.