An eerie whistle from the Earth panel halted him. The three turned at the summons, infraction of all space battle procedure except in cases of extreme urgency. Only once before in five years had that whistle sounded during either battle practice or battle. Then it was to announce war with Mercury. Now.... The visaplate crawled up from black through purple to yellow and white. A voice came through but there was no face accompanying it. "Signal six-two ... signal six-two...." "No!" Wing cried out. "Signal six-two ... signal six-two...." Wing glanced at the battle visaplate. The Mercurians were in full rout. We've got them licked, he thought; they're running. Now this. "Signal six-two...." the Earth voice repeated. Lt. Packer said, "Commander Wing, what is signal six-two? I thought there were only sixty-one code numbers." Curt Wing looked at Packer but his dark eyes were blank, the lips thinned and harsh. "Signal six-two, lieutenant?" he asked, and there was no life in his voice. "It takes precedence over everything an Earthman has. Life, liberty, home, happiness--everything. We must return to Earth at once. To hell with the Mercurians. They're unimportant." Curt Wing spoke into the intercom: "Commander to all ships. Abandon chase. Gain formation. We're returning to home base." The formation board began to blink as ship captains acknowledged the order. But where each green light of acquiescence lighted up, below it came also the yellow light of query. Wing pushed on the all-ship button on the officers' intercom system and said quietly: "Signal six-two--you know what that means." The yellow query lights went off immediately, the green ones blinked off, on, then off again. "Yes," Wing said to Lt. Packer, "The Mercurians are unimportant compared to this. Signal six-two is the emergency signal for earth catastrophe. What's wrong I don't know. But whatever it is, a mere interplanetary war is a kindergarten class." He ran his blunt-fingered hands through his hair. "Gee, Cap," said Dead-Eye suddenly. "That's bad, huh?" "Yes, Dead-Eye," Wing said softly. "It's bad. Very bad." "You'll fix it, won't you, Cap?" Dead-Eye asked, and his light-blue eyes were trusting. "You can do anything, Cap. Why, didn't you find Elizabeth for me?" Wing stared at Dead-Eye's hulking figure. Finally he said, "I think this will be slightly more difficult than picking Elizabeth out of a museum case, Dead-Eye." * * * * * Earth below them now, its diadem of clouds winking in the reflected shafts of light from the moon. What danger lay there? What danger so great that they must let a victory become a might-have-been. What catastrophe so important that a fight for interplanetary life was dismissed casually with the signal. Curt Wing shrugged his shoulders, heard that incessant signal boring monotonously into his ears.