He couldn't blame them. He'd made another difficulty, too. Blaster in hand, he'd made the _Nadine_ take off from Coryus III with a trip-tape picked at random for guidance. But the trip-tape had been computed for another starting-point, and when the yacht came out of overdrive it was because the drive had been dismantled in the engine-room. So the ship's location was in doubt. It could have travelled at almost any speed in practically any direction for a length of time that was at least indefinite. A liner could re-locate itself without trouble. It had elaborate observational equipment and tri-di star-charts. But smaller craft had to depend on the Galactic Directory. The process would be to find a planet and check its climate and relationship to other planets, and its flora and fauna against descriptions in the Directory. That was the way to find out where one was, when one's position became doubtful. The _Nadine_ needed to make a planet-fall for this. The rest of the ship's company came into the control-room. Burleigh waved his hand at the speaker. "Listen!" * * * * * They heard it. All of them. It was a trilling, whining sound among the innumerable random noises to be heard in supposedly empty space. "That's a marker," Carol announced. "I saw a costume-story tape once that had that sound in it. It marked a first-landing spot on some planet or other, so the people could find that spot again. It was supposed to be a long time ago, though." "It's weak," observed Burleigh. "We'll try answering it." Moran stirred, and he knew that every one of the others was conscious of the movement. But they didn't watch him suspiciously. They were alert by long habit. Burleigh said they'd been Underground people, fighting the government of their native world, and they'd gotten away to make it seem the revolt had collapsed. They'd go back later when they weren't expected, and start it up again. Moran considered the story probable. Only people accustomed to desperate actions would have remained so calm when Moran had used desperate measures against them. Burleigh picked up the transmitter-microphone. "Calling ground," he said briskly. "Calling ground! We pick up your signal. Please reply." He repeated the call, over and over and over. There was no answer. Cracklings and hissings came out of the speaker as before, and the thin and reedy wabbling whine continued. The _Nadine_ went on toward the enlarging cloudy mass ahead. Burleigh said; "Well?" "I think," said Carol, "that we should land. People have been here. If they left a beacon, they may have left an identification of the planet. Then we'd know where we are and how to get to Loris."