Kendall sat for a long time staring at the blank screen--smoking endless cigarettes. After a while, he got wearily to his feet and looked at his watch. In seven hours and twenty-five minutes he would be on a Centaurian ship that would lift out of Terra's orbit and start bending space into time until.... * * * * * The pale, green globe of Centaur hung in a black sky; greatened and darkened and Kendall was looking out across the huge rocket port from which the Centaurians planned to launch Terra's destruction. Now, for the first time, he saw the Centaurian without the mask. The man was handsome. He had the cruel black eyes of all Centaurians. He smiled coldly. "We've come a long way, Kendall. I suppose you want to see your wife." "No." That was a surprise. "I don't quite understand. Your feeling for her is--" "Such that I wouldn't dare allow myself close to her or I wouldn't have the courage to let her go again." "It's unnecessary that you do. We Centaurians keep our bargains." "I've made my decision." Kendall did watch Clare as they took her from the building to the Venus-bound rocket. His heart lifted at sight of her slim beauty, at the proud manner in which she carried herself, at the disdainful tilt of her head. Then she disappeared inside the rocket and he was again bleak and lonely. He put himself at the disposal of the Centaurian scientists and discovered why Terra had stayed ahead for a century in the cold war. They were able, but stolid and methodical. They did not possess the unfettered imaginative force that made Terran scientists supreme. Day by day the great lethal monster took form and Kendall's dread increased as the time of completion approached. Then the momentous morning arrived. Aside from asking technical questions and seeking guidance, the Centaurians left Kendall strictly alone; treated him with contempt all traitors are accorded even from those they help. Kendall did not seem to mind. In fact he preferred being alone. Then one morning the Centaurian approached him. "The launching is today. Would you like to witness the death stroke? The gesture with which we slay your planet?" Kendall shrugged. "It makes little difference." "We will watch together from the tower...." * * * * * Two junior scientists in Plant Nine were discussing Kendall's disappearance. "His leave was on the level. Signed by the Chief. Three days." "Did he actually go to Yellowstone?" "They're pretty sure he did. After that he vanished into thin air." "Nobody vanishes into thin air." The junior scientist looked around and lowered his voice. "Do you think he defected?" "I don't know. But I got the story pretty straight--that is, as much as the high brass knows." "You did?" "The day before he left, Kendall went to the file vaults to check the prints on _Willy Seven_." "No!" "Yes."