Excerpt:

If I speak of myself in this story, it is because I have been deeply involved in its startling events, events doubtless among the most extraordinary which this twentieth century will witness. Sometimes I even ask myself if all this has really happened, if its pictures dwell in truth in my memory, and not merely in my imagination. In my position as head inspector in the federal police department at Washington, urged on moreover by the desire, which has always been very strong in me, to investigate and understand everything which is mysterious, I naturally became much interested in these remarkable occurrences. And as I have been employed by the government in various important affairs and secret missions since I was a mere lad, it also happened very naturally that the head of my department placed In my charge this astonishing investigation, wherein I found myself wrestling with so many impenetrable mysteries.

In the remarkable passages of the recital, it is important that you should believe my word. For some of the facts I can bring no other testimony than my own. If you do not wish to believe me, so be it. I can scarce believe it all myself.

The strange occurrences began in the western part of our great American State of North Carolina. There, deep amid the Blueridge Mountains rises the crest called the Great Eyrie. Its huge rounded form is distinctly seen from the little town of Morganton on the Catawba River, and still more clearly as one approaches the mountains by way of the village of Pleasant Garden.

Why the name of Great Eyrie was originally given this mountain by the people of the surrounding region, I am not quite Sure It rises rocky and grim and inaccessible, and under certain atmospheric conditions has a peculiarly blue and distant effect. But the idea one would naturally get from the name is of a refuge for birds of prey, eagles condors, vultures; the home of vast numbers of the feathered tribes, wheeling and screaming above peaks beyond the reach of man. Now, the Great Eyrie did not seem particularly attractive to birds; on the contrary, the people of the neighborhood began to remark that on some days when birds approached its summit they mounted still further, circled high above the crest, and then flew swiftly away, troubling the air with harsh cries.

Why then the name Great Eyrie? Perhaps the mount might better have been called a crater, for in the center of those steep and rounded walls there might well be a huge deep basin. Perhaps there might even lie within their circuit a mountain lake, such as exists in other parts of the Appalachian mountain system, a lagoon fed by the rain and the winter snows. In brief was not this the site of an ancient volcano, one which had slept through ages, but whose inner fires might yet reawake? Might not the Great Eyrie reproduce in its neighborhood the violence of Mount Krakatoa or the terrible disaster of Mont Pelee? If there were indeed a central lake, was there not danger that its waters, penetrating the strata beneath, would be turned to steam by the volcanic fires and tear their way forth in a tremendous explosion, deluging the fair plains of Carolina with an eruption such as that of 1902 in Martinique?

Indeed, with regard to this last possibility there had been certain symptoms recently observed which might well be due to volcanic action. Smoke had floated above the mountain and once the country folk passing near had heard subterranean noises, unexplainable rumblings. A glow in the sky had crowned the height at night.

When the wind blew the smoky cloud eastward toward Pleasant Garden, a few cinders and ashes drifted down from it. And finally one stormy night pale flames, reflected from the clouds above the summit, cast upon the district below a sinister, warning light.

In presence of these strange phenomena, it is not astonishing that the people of the surrounding district became seriously disquieted. And to the disquiet was joined an imperious need of knowing the true condition of the mountain. The Carolina newspapers had flaring headlines, "The Mystery of Great Eyrie!" They asked if it was not dangerous to dwell in such a region. Their articles aroused curiosity and fear—curiosity among those who being in no danger themselves were interested in the disturbance merely as a strange phenomenon of nature, fear in those who were likely to be the victims if a catastrophe actually occurred. Those more immediately threatened were the citizens of Morganton, and even more the good folk of Pleasant Garden and the hamlets and farms yet closer to the mountain.

Assuredly it was regrettable that mountain climbers had not previously attempted to ascend to the summit of the Great Eyrie. The cliffs of rock which surrounded it had never been scaled. Perhaps they might offer no path by which even the most daring climber could penetrate to the interior. Yet, if a volcanic eruption menaced all the western region of the Carolinas, then a complete examination of the mountain was become absolutely necessary.

Now before the actual ascent of the crater, with its many serious difficulties, was attempted, there was one way which offered an opportunity of reconnoitering the interior, with out clambering up the precipices. In the first days of September of that memorable year, a well-known aeronaut named Wilker came to Morganton with his balloon. By waiting for a breeze from the east, he could easily rise in his balloon and drift over the Great Eyrie. There from a safe height above he could search with a powerful glass into its deeps. Thus he would know if the mouth of a volcano really opened amid the mighty rocks. This was the principal question. If this were settled, it would be known if the surrounding country must fear an eruption at some period more or less distant.