"Gravity can be turned on or off," said Docchi puzzledly, searching her face for some sign. "And regulated, within certain narrow limits. But somehow you doubled or tripled the normal amount. How?"

Nona smiled questioningly.

"Gravity engineers would like to know that too," said Jordan.

"Everybody would like to know," Anti interrupted irritably. "Except me. I'm too pragmatic, I suppose, but I want to know when we start the rockets and be on our way."

"It isn't that easy," sighed Jordan. "A retracted combustion cap in flight generally means at least one burned-out tube." He made his way to the instrument panel and looked at it glumly. "Three."

"A factor." Docchi nodded. "But I was thinking about the robot."

Anti was impatient. "An interesting subject, no doubt. What about it?"

"Where did it get instructions? Not radio; the hull of the ship cuts off all radiation. The last we knew, it was in our control."

"All right, how?"

"Voice," said Docchi. "Cameron's voice, to be exact."