If he knew, there was nothing she could do about it. She said, "Perhaps Mr.—"
She paused, and the man said dully, "Callendar."
"Perhaps if Mr. Callendar would have dinner with us and tell us a little more, we'd be better able to help."
"Not a bad idea, Carol. We should know a little more."
Carol selected a dinner and pressed the button that would start its preparation.
Her father said casually, "You are a stranger to Ganymede, aren't you, Mr. Callendar?"
"I'm not sure of that," said the man.
Her father's eyebrows went up.
Carol said, "But you do come from one of Jupiter's moons?"
"I can't remember which one. There are a lot of things that my memory's hazy about. I can't even recall the name of the company I worked for as an engineer."