"Your High Command," said the Coordinator grimly, "has decided not to try to take over the nation around us. It is considered impractical. So this nation is to be destroyed, to shatter the backbone of the WDA and make resistance anywhere else unthinkable." The Ambassador said reproachfully: "Ah, but you begin to believe your own propaganda!" "No," said the Coordinator. "I have simply told you the facts you undoubtedly already know. Now I tell you our best-kept military secret. We know that we cannot deal with you. We know that you might be successful in an overwhelming, unwarned attack. We know that if you decide upon war, it will be directed primarily at this nation. So we have set up some very special atomic bombs where it is extremely unlikely that you will find them. They are 'dirty' bombs. They are designed to make the maximum possible amount of radioactive dust--of fallout. Timing mechanisms are set to detonate them. Every day a man goes and sets back the timing mechanism in each place where a bomb is established. On the day that a man fails to do so the bombs will certainly explode." The Coordinator said almost briskly: "We calculate that the bombs will make the atmosphere of the whole Earth lethally radioactive. They will raise the background count on Earth to the point where nothing can live: no plant, no animal, no fish in any sea. This will only happen if this nation is destroyed. It will fight if it is attacked, of course, but your chances of substantial success are good. But if you are successful the Earth will die. I may add that the people of the Com nations will die also, to the last individual." The Ambassador started to his feet. "But you could not do that!" he protested white-lipped. "You cannot!" The Coordinator shrugged and shook his head. "I have not lied to you before, Mr. Ambassador. I do not lie to you now." Then he said formally: "I hope you have a pleasant journey home." IV The _Lotus_ came out of the usual sequence of arrival-hops no more than six light-seconds from Earth. A million miles, more or less; perhaps four times the distance of the Moon. Nolan examined the planet's sunlit face and said steadily: "Nothing's happened yet." There was almost agonized relief. Only the skipper did not seem to relax. He went stolidly to the control-room and got out the scrambler card that matched just one other scrambler card in the world. He put it in the communicator. To speak to Earth by scrambler would be an offense. It would be protested by the Coms. They would insist that a survey ship should have nothing secret to report and that anything secret must be inimical to the Com Association of Nations. The skipper formally reported in, in the clear, and then insisted on completing his report by scrambler. He did complete it, over the agitated protest of the ground. Then there was silence. He mopped his forehead.