Greg looked at him. "I don't know."

"We could check the register."

"I already checked it. He has not logged in, but that doesn't mean anything."

"I suppose not," Tom said glumly.

They were silent for a moment. Then Greg said, "Look, what are you worried about? Nothing could have happened to Dad. He's been mining the Belt for years."

"I know. I just wish he were here, that's all. If he's in some kind of trouble...."

"What kind of trouble? You're looking for spooks."

"Spooks like Jupiter Equilateral, maybe," Tom said. "They could make plenty of trouble for Dad."

"With the U.N. in the driver's seat here? They wouldn't dare. Why do you think the major rides them so hard with all the claim-filing regulations? He'd give his right arm for a chance to break that outfit into pieces."

"I still wish somebody had gone out to the Belt with Dad," Tom said.