"I could have jumped him," he told himself with bitter self-reproach; "I could have grabbed the pistol from Kreiss--the man was petrified." And then Chet had to admit a fact there was no use of denying: "I was as paralyzed as he was," he said, and only knew he had spoken aloud when he saw the puzzled look that crossed Harkness' face. Harkness and Diane had drawn near. In a far corner of the little room Schwartzmann had motioned to Kreiss to join him; they were as far away from the others as could be managed. Schwartzmann, Chet judged, needed some scientific explanation of these disturbing events; also he needed to take the detonite pistol from Kreiss' hand and jam it into his own hand. His eyes, at Chet's unconscious exclamation, had come with instant suspicion toward the two men. "Forty-seven hours, Walt," the pilot said, and repeated it loudly for Schwartzmann's benefit; "--forty-seven hours before we return to this spot. We are driving out into space; we've crossed the orbit of the Dark Moon, and we're doing twenty thousand miles an hour. "Now we must decelerate. It will take twenty hours to check us to zero speed; then twenty-seven more to shoot us back to this same point in space, allowing, of course, for a second deceleration. The same figuring with only slight variation will cover a return to the Dark Moon. As we sweep out I can allow for the moon-motion, and we'll hit it at a safe landing speed on the return trip this time." * * * * * Chet was paying little attention to his companion as he spoke. His eyes, instead, were covertly watching the bulky figure of Schwartzmann. As he finished, their captor shot a volley of questions at the scientist beside him; he was checking up on the pilot's remarks. Chet was leaning forward to stare intently from a lookout, his head was close to that of Harkness. "Listen, Walt," he whispered; "the Moon's out of sight; it's easy to lose. Maybe I can't find it again, anyway--it's going to take some nice navigating--but I'll miss it by ten thousand miles if you say so, and even the Herr Doktor can't check me on it." Chet saw the eyes of Schwartzmann grow intent. He reached ostentatiously for another book of tables, and he seated himself that he might figure in comfort. "Just check me on this," he told Harkness. He put down meaningless figures, while the man beside him remained silent. Over and over he wrote them--would Harkness never reach a decision?--over and over, until-- "I don't agree with that," Harkness told him and reached for the stylus in Chet's hand. And, while he appeared to make his own swift computations, there were words instead of figures that flowed from his pen.