"Easy, Tom," Greg said.
"Well, I won't take it easy. Dad was too careful for something like that to happen. If he had an accident, somebody made it happen."
Greg turned to the major. "What was Dad doing out there?"
"Mining."
"By himself? No crew at all?"
"No, he was alone."
"I thought the regulations said there always had to be at least two men working an asteroid claim."
"That's right. Your father had Johnny Coombs with him when he left Sun Lake City. They signed out as a team ... and then Johnny came back to Mars on the first shuttle ship."
"How come?"
"Not even Johnny knows. Your father just sent him back, and there was nothing we could do about it then. The U.N. has no jurisdiction in the belt, unless a major crime has been committed." Major Briarton shook his head helplessly. "If a man is determined to mine a claim all by himself out there, he can find a dozen different ways to wiggle out of the regulations."