"This," said chief Van Isaac, "is our new trouble spot." The older man's rodlike finger probed decisively at a violet dot placed on a thin yellow line of a circle, third out from a sun. Other dots peppered the giant glazed star map, companions of which hung on the other three walls of the chamber. "Valaya is the name of the place," Van Isaac continued. "Perhaps you know something about it." "Not much," said the other, a thirtyish, lean man by the name of Arnold Koven. "I mean, not a great deal b