The whole property was irregularly circular, perhaps a mile in diameter covering the almost flat dome of the hilltop. Around it, completely enclosing it, Polter had built a stone and brick wall. A miniature wall of China! We could see that it was fully thirty feet high with what evidently were naked high-voltage wires protecting its top. There were half a dozen little gates, securely barred, with doubtless a guard at each of them. Within the wall there were several buildings: a few small stone houses suggesting workmen's dwellings; an oblong stone structure with smoke funnels which seemed perhaps a smelter; a huge, dome-like spread of translucent glass over what might have been the top of a mine-shaft. It looked more like the dome of an observatory--an inverted bowl fully a hundred feet wide and equally as high, set upon the ground. What did it cover? And, there was Polter's residence--a castle-like brick and stone building with a central tower not unlike a miniature of the Chateau Frontenac. We saw a stone corridor on the ground connecting the lower floor of the castle with the dome, which lay about a hundred feet to one side. Could we chance landing inside the wall? There was a dark, level expanse of snow where we could have done it, but our descending plane would doubtless have been discovered. But the mile-wide inner area was dark in many places. Spots of light were at the little wall-gates. There was a glow all along the top of the wall. Lights were in Polter's house; they slanted out in yellow shafts to the nearby white ground. But for the rest, the whole place was dark, save a dim glow from under the dome. I shook my head at Alan's suggestion. "We couldn't land inside." We had circled back and were a mile or so off toward the river. "You saw guards down there. But that low stretch outside the gate on this side--" A plan was coming to me. Heaven knows it was desperate enough, but we had no alternative. We would land and accost one of the gate guards. Force our way in. Once inside the wall, on foot in the darkness of this blizzard, we could hide; creep up to that dome. Beyond that my imagination could not go. * * * * * We landed in the snow a quarter of a mile from one of the gates. We left the plane and plunged into the darkness. It was a steady upward slope. A packed snowfield was under foot, firm enough to hold our shoes, with a foot or so of loose soft snow on its top. The falling flakes whirled around us. The darkness was solid, Our helmeted leather-furred flying suits were soon shapeless with a gathering white shroud. We carried our Essens in our gloved hands. The night was cold, around zero I imagine, though with that biting wind it felt far colder. From the gloom a tiny spot of light loomed up. "There it is, Alan. Easy now! Let me go first." The wind tore away my words. We could see the narrow rectangle of bars at the gate, with a glow of light behind them.