"D'you think, sergeant, it could be Huks sneaked back—?"
Sergeant Madden did not answer. He went back to the squad ship and armed himself. Patrolman Willis followed suit. The sergeant boobied the squad ship so no unauthorized person could make use of it, and so it would disable itself if anyone with expert knowledge tried. Therefore, nobody with expert knowledge would try.
The two cops began a painstaking quest for police-type evidence to tell them what had happened, and how and why the Cerberus was missing, after a clumsy but safe landing on Procyron III and when all sanity demanded that it stay there, and when it was starkly impossible for it to leave.
Sergeant Madden and Patrolman Willis were, self-evidently, the only human beings on a planet some nine thousand miles in diameter. It was easy to compute that the nearest other humans would be at least some thousands of thousands of millions of miles away—so far away that distance had no meaning. This planet was something over nine-tenth rolling sea, but there were a few tens of thousands of square miles of solid ground in the one archipelago that broke the ocean's surface. It was such loneliness as very few people ever experience. But they did not notice it. They were busy.
They went over the ground immediately about the landing place. Rocket flame had splashed it, both at the Cerberus' landing and at the impossible take-off. There was nothing within a hundred yards not burned to a crisp. They searched outside that area. Sergeant Madden rumbled to his companion:
"Where'd the other ship land?"
Patrolman Willis blinked at him.
"There had to be another ship!" said Sergeant Madden irritably. "To bring the extra rockets. The other ship had to've brought 'em. And it had to have rockets of its own. There's no spaceport here!"
Patrolman Willis blinked again. Then he saw. The Cerberus carried one set of emergency-landing rockets, for use in a descent on a refuge planet if the need arose. The need had arisen and the Cerberus had used them. Then, from somewhere, another set of rockets had been produced for it to use in leaving. Those other rockets must have come on another ship. But it was a trifle more complicated than that. The Cerberus had carried one set of rockets and used them. One. It had been supplied with another set from somewhere. Two. They must have been brought by a ship which also used a set of rockets to land by. That made three. Then the other ship must have had a fourth set for its own take-off, or it would be grounded forever on Procyron III.