Countless times this day had been described in fiction, but no one had really believed that it would ever come. Now it had dawned at last; the gleaming, silent shapes hanging over every land were the symbol of a science Man could not hope to match for centuries. For six days they floated motionless above his cities, giving no hint they knew of his existence. But none was needed; not by chance alone could those mighty ships have come to rest so precisely over New York, London, Paris, Moscow, Rome, Cape Town, Tokyo, Canberra….

Even before the ending of those heart-freezing days, some men had guessed the truth. This was not the first tentative contact by a race which knew nothing of man. Within those silent, unmoving ships, master psychologists were studying humanity's reactions. When the curve of tension had reached its peak, they would act.

And on the sixth day Karellen, Supervisor for Earth, made himself known to the world in a broadcast that blanketed every radio frequency. He spoke in English so perfect that the controversy it began was to rage across the Atlantic for a generation. But the context of the speech was more staggering even than its delivery. By any standards, it was a work of superlative genius, showing a complete and absolute mastery of human affairs. There could be no doubt that its scholarship and virtuosity, its tantalizing glimpses of knowledge still untapped were deliberately designed to convince mankind that it was in the presence of overwhelming intellectual power. When Karellen had finished, the nations of Earth knew that their days of precarious sovereignty had ended. Local, internal governments would still retain their powers, but in the wider field of international affairs the supreme decisions had passed from human hands. Arguments—protests—all were futile.

It was hardly to be expected that all the nations of the world would submit tamely to such a limitation of their powers.