His voice was clipped, rapid. "I think it's about time we stopped worrying about our own affairs and thought of those of the Solar System, partly because I think they have a direct bearing on the disappearances of Ivan end Rosalind. As I told you, I've been sorting out the crucial items from the material we've been presenting. There are roughly four of those items, as I see it. It's rather like a mystery story. I wonder if, hearing those four clues, you will come to the same conclusion I have." The others nodded. "First, there are the latest reports from Deep Shaft, which, as you know, has been sunk to investigate deep-Earth conditions. At approximately twenty-nine miles below the surface, the delvers have encountered a metallic obstruction which they have tentatively named the durasphere. It resists their hardest drills, their strongest corrosives. They have extended a side-tunnel at that level for a quarter of a mile. Delicate measurements, made possible by the mirror-smooth metal surface, show that the durasphere has a slight curvature that is almost exactly equal to the curvature of the Earth itself. The suggestion is that deep borings made anywhere in the world would encounter the durasphere at the same depth. "Second, the movements of the moons of Mars and Jupiter, and particularly the debris left behind by the moons of Mars. Granting Phobos and Deimos had duraspheres proportional in size to that of Earth, then the debris would roughly equal in amount the material in those two duraspheres' rocky envelopes. The suggestion is that the two duraspheres suddenly burst from their envelopes with such titanic velocity as to leave those disrupted envelopes behind." It was deadly quiet in the committee room. "Thirdly, the disappearances of Ivan and Rosalind, and especially the baffling hint--from Ivan's message in one case and Rosalind's downward-pointing glove in the other--that they were both somehow drawn into the depths of the Earth. "Finally, the dreams of the ESPs, which agree overwhelmingly in the following points: A group of beings separate themselves from a godlike and telepathic race because they insist on maintaining a degree of mental privacy. They flee in great boats or ships of some sort. They are pursued on such a scale that there is no hiding place for them anywhere in the universe. In some manner they successfully camouflage their ships. Eons pass and their still-fanatical pursuers do not penetrate their secret. Then, suddenly, they are detected." Edmund waited. "Do you see what I'm driving at?" he asked hoarsely. * * * * * He could tell from their looks that the others did, but couldn't bring themselves to put it into words.