"Well," said Rocky reluctantly, "I guess you'd better know. According to the seismograph, Colossus has almost completed his circumambulation of Titan ... and is on his way back toward New Boston. You must be very, very careful. And now, good-bye! See you later!" The circuit faded, and he was gone. Lynn stood for a moment thinking swiftly. Then she decided. Better to _do_ something than to just sit waiting ... waiting ... waiting ... in a city gone mad with fear. She would start toward the Base _now_, meet Rocky on the way. Having made her decision, she turned quickly and took her place in the jostling throng pressing southward.... * * * * * Rocky, moving north on the New Boston safeway, as he wormed his roller through the ever-thickening mass of panicky Titanians and terrified Earth colonists rushing to the safety of the Base was once again--for perhaps the hundredth time--trying to grasp that elusive half-thought which had lurked in the back of his brain ever since Colossus had broken free. Something Grossman had said--Grossman who now cowered in a Patrol cell, far from the haughty, autocratic figure he had pretended to be--had brushed a spark in Rocky's mind. But now that spark had dulled, and Rocky could not recapture it. It had something to do with Colossus ... it suggested some means of combating.... "_Damnation!_" The hordes of refugees had been parting like a flesh sea before him ever since he left the Fort gates. But now the numbers were becoming so great that he could not move the roller through them except at a crawl. He realized this, and gave up the unequal struggle. He called an Earthman to him. "Here, you--can you drive a roller?" "Yes, indeed, sir!" "Then take this back to Colonel Graham at the Fort. Tell him Captain Russell is going ahead on foot." The colonist stared at him strikingly. "You--do you mean you're going back toward the city, sir? But you can't do that! It--it's suicide. They say a huge monster, ten miles tall, is coming to smash the city to pieces--" Rocky said tightly, "Never mind that now. You give my message to the Commandant--_understand_?" And he climbed from the car and forced his way against the tide, northward on foot. It was as he was pressing along that he thought of Bud Mulligan, who had gone out with "B" flight in an effort to find and destroy--or at least delay--Colossus. Thinking of Bud reminded him that they wore on their persons the means of constant communication. The chances were greatly against Bud's being on the beam, but it was worth a try. He took the miniature vocoder from his breast pocket and activated it on the secret S.I.D. wave-length. Vastly to his surprise, he got an immediate reply. "O.Q., chief! Where in Tophet have you been? I've been buzzing you for the past hour and a half!" Rocky signaled back, "Where are you, Bud?"