"All right," said Hyrst. "So the Titanite find is all yours. You're still a partner in the refinery, remember. And you've still got an obligation to the rest of us, so you can damn well get in and do your job."

"Don't worry. I've always done my job."

"More or less," said Hyrst. "For your information, I've seen better engineers in grade-school. There's Number Three hoist. It's been busted for a week. Now let's get in there and fix it."

The two figures in Hyrst's memory toiled on, out of the area of roads to the edge of the landing field, where the ships come to take away the refined uranium. Number Three hoist rose in a stiff, ugly column from the ground. It was supposed to fetch the uranium up from the underground storage bins and load it into a specially-built hot-tank ship in position at the dock. But Number Three had balked and refused to perform its task. In this completely automated plant, men were only important when something went wrong. Now something was wrong, and it was up to MacDonald, the mechanical engineer, and Hyrst, the electronics man, to set it right.

Hyrst opened the hatch, and they climbed the metal stairs to the upper chamber. Number Three's brain was here, its scanners, its tabulating and recording apparatus, its signal system. A red light pulsated on a panel, alone in a string of white ones.

"Trouble's in the hoist-mechanism," said Hyrst. "That's your department." He smiled and sat down on a metal bench in the center of the room, with his back to the stair. "D Level."

MacDonald grumbled, and went to a skeletal cage built over a round segment of the floor. Various tools were clipped to the ribs of the cage. MacDonald pulled an extra rayproof protectall over his vac-suit and stepped inside the cage, pressing a button. The cage dropped, into a circular shaft that paralleled the hoist right down to the feeder mechanism.

Hyrst waited. Inside his helmet he could hear MacDonald breathing and grumbling as he worked away, repairing a break in the belt. He did not hear anything else. Then something happened, so swiftly that he had never had any memory of it, and some time later he came to and looked for MacDonald. The cage was way down at the bottom of the shaft and MacDonald was in it, with a very massive pedestal-block on top of him. The block had been unbolted from the floor and dragged to the edge of the shaft, and it could not possibly have been an accident that it tumbled in, between the 

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