Neither Rena nor the Guards spoke, but I could feel in their tense attitudes that this was the danger-point. We were in the lair of the enemy. Undoubtedly we were being followed in a hundred radars, and the frequency-pattern would reveal our copter for what it was--a Roman police plane that had no business in that area. Even if the Company let us pass, there was always the chance that some Neapolitan radarman, more efficient, or more anxious for a promotion, than his peers would alert an interceptor and order us down. Certainly, in the old days, interception would have been inevitable; for Naples had just completed a war, and only short weeks back an unidentified aircraft would have been blasted out of the sky. But we were ignored. And that, I thought to myself, was another facet to the paradox. For when, in all the world's years before these days of the Company, was there such complacency, such deep-rooted security, that a nation just out of a war should have soothed its combat-jangled nerves overnight? Perhaps the Company had not ended wars. But the _fear_ of wars was utterly gone. We fluttered once around the volcano, and dipped in to a landing on a gentle hump of earth halfway up its slope, facing Naples and the Bay. We were a few hundred yards from a cluster of buildings--perhaps a dozen, in all. I jumped out, stumbling and recovering myself. Rena stepped lightly into my arms. And without a word, the Guards fed fuel to the jets, the rotor whirled, and the copter lifted away from us and was gone. Rena peered about us, getting her bearings. There was a sliver of a moon in the eastern sky, enough light to make it possible to get about. She pointed to a dark hulk of a building far up the slope. "The Observatory. Come, Tom." * * * * * The volcanic soil was rich, but not very useful to farmers. It was not only the question of an eruption of the cone, for that sort of hazard was no different in kind than the risk of hailstorm or drought. But the mountain sides did not till easily, its volcanic slopes being perhaps steeper than those of most mountains. The ground under our feet had never been in cultivation. It was pitted and rough, and grown up in a tangle of unfamiliar weeds. And it was also, I discovered with considerable shock, warm to the touch. I saw a plume of vapor, faintly silver in the weak light, hovering over a hummock. Mist, I thought. Then it occurred to me that there was too much wind for mist. It was steam! I touched the soil. Blood heat, at least. I said, with some difficulty, "Rena, look!" She laughed. "Oh, it is an eruption, Tom. Of course it is. But not a new one. It is lava, you see, from the little blast the Sicilians touched off. Do not worry about it...." We clambered over the slippery cogs of a funicular railway and circled the ancient stone base of the building she had pointed to. There was no light visible; but Rena found a small door, rapped on it and presently it opened.