"And suppose," said Fry, "that their secret experiments with Ym-400 result in turning another planet into an asteroid cloud?" "That's an extreme possibility," Camhorn said, "though it exists. The point is that it exists now whatever we choose to do about it. We can only attempt to minimize the risks." "You'd still sooner catch them before they start playing around with the stuff?" "Of course we would. But we're working against time there." * * * * * "How much time do we have before the thing gets critical?" "Well," said Camhorn, "assume they've had at least four or five years to prepare for the day when they could bring a quantity of Ym-400 into their possession. They'll have made every necessary arrangement for concealed full-scale experimentation. But, unless they are utterly reckless, they still have to conduct a thorough preliminary investigation of the compound and its possibilities. That phase of the matter shouldn't be too dangerous, and it can't be concluded in less than six months." Fry shook his head exasperatedly. "Six months!" he said. "We might get lucky and pick them up next week, Howard ... but there are eighteen planets and planet-class satellites at peak population levels, seventy-three space cities with a total of eight times the planetary populations, five Freeholder planets on each of which you could keep an army concealed indefinitely if you wanted to go to the trouble. Add in close to a hundred thousand splinter populations on semihabitables, asteroids, spaceborne in fixed stations and mobile craft--we can't do it, Howard! Not in six months. We've already started putting anyone who might have the slightest connection with that space transport job through the strainer, and we'll get on your lists of suspects as soon as they're placed in our hands. "But don't expect results in anything less than a year...." * * * * * Fry, for once, had been too optimistic. A year and a half went by. Endless series of more or less promising leads were run into the ground. The missing Ym-400 didn't turn up. The IPA put out its nets again, and began to check over the possibilities that were left. * * * * *