What was doing all this awful business? He surmised that some anti-gravitational agency was responsible for the levitation of the Vandercook building, but what sort of intelligence was directing it? Was the intelligence human? Bestial? Maniacal? Or was it something from Outside? Jeter did not think the latter could be considered. He didn't believe that any planet, possibly inhabited, was close enough to make a visit possible. At any rate, he felt that there should be some sort of warning. He held to the belief that the whole thing was caused by human, and earthly, intelligence. But why? The world was at peace. And yet.... Thousands of lives had been snuffed out, a twelve-story building had leaped five thousand feet into the air, and the world's biggest bridge had turned upstream as though turning its back against the mad traffic it had at last been called upon to bear. Eyer was going over their plane with the visitors, men of intellect who were taking notes at top speed, men who knew planes and were quick to grasp new appliances. "Have any of you got the whole story now?" Eyer asked. A half dozen men nodded. "Then pass your knowledge on to the others. Jeter and I must get ready to be off. Every minute we delay costs untold numbers of lives." Willing hands rolled their ship out to their own private runway, while Jeter and Eyer made last minute preparations. There was the matter of food, of oxygen necessary so far above the Earth, of clothing. All had been provided for and their last duties were largely those of checking and rechecking, to make sure no fatal errors in judgment had been made. Eyer was to fly the ship in the beginning. A small crowd watched as the partners, white of face now in the last minutes of their stay on Earth--which they might never touch again in life--climbed into their cabin, which was capable of being sealed against the cold of the heights and the lack of breathable oxygen. Nobody smiled at them, for the world had stopped smiling. Nobody waved at them, for a wave would have been frivolous. Nobody cheered or even shouted--but the two knew that the best wishes, the very hopes for life, of all the land, went with them into the ghastly unknown. CHAPTER V _Into the Void_ Their watches and the clock in the plane were synchronized with Hadley's time, which was Eastern Standard, and as soon as the plane had reached eight thousand feet altitude, Jeter spoke into the radiophone and arranged for a connection with the office of Hadley. Hadley himself soon spoke into Jeter's ear. "Yes, Jeter?" "See that someone is always at your radiophone to listen to us. I'll keep you informed of developments as long as possible. Everything is running like clockwork so far. How is it with you?"