How long it lay unfound, I cannot say. Perhaps, for days, it still maintained its invisibility, while the frantic planes of the U. S. Anti-War Department tried in vain to locate it. And then, with its magnetic batteries exhausting themselves, it must have become visible. Perona, making a solo flight upon Nareda business to Great London, came upon it. Perona, Spawn and De Boer were then in the midst of their smuggling activities. They salvaged the vessel secretly. De Boer, with an incongruous flair for mechanical science, was enabled in his bandit camp, to recondition the flyer--building a workshop for the purpose, with money which Perona freely supplied. Some of this I learned from De Boer, some is surmise: but I am sure it is close to the facts. * * * * * I have since had an opportunity--through my connection with this adventure which I am recording--of going aboard one of the X-flyers of the Anti-War Department, and seeing it in operation with its technical details explained to me. But since it is so important a Government secret, I cannot set it down here. The principles involved are complex: the postulates employed, and the mathematical formulae developing them in theory, are far too intricate for my understanding. Yet the practical workings are simple indeed. Some of them were understood as far back as 1920 and '30, when that pioneer of modern astrophysics, Albert Einstein, first proved that a ray of light is deflected from its normal straight path when passing through a magnetic field. I am sorry that I cannot give here more than this vague hint of the workings of the fantastic invisible flyers which to-day are so often the subject of speculation by the general public which never has seen them, and perhaps never will. But I think, too, that a lengthy pedantic discourse here would be out of place. And tiring. After all, I am trying to tell only what happened to me in this adventure. And to little Jetta. A very strangely capable fellow, this young De Boer. A modern pirate: no other age could have produced him. He did not spare Perona's money, that was obvious. From his hidden camp he must have made frequent visits to the great Highland centers, purchasing scientific equipment: until now, when his path crossed mine. I found him surrounded by most of the every-day devices of our modern world. The village of Nareda was primitive: backward. Save for its modern lights, a few local audiphones and image-finders, and its official etheric connections with other world capitals, it might have been a primitive Latin American village of a hundred years ago. * * * * * But not so De Boer's camp, which presently I was to see. Nor this, his flyer, with which his smuggling activities had puzzled Hanley's Office for so many months. There was nothing primitive here.