Mistress Tisalver returned with her daughter in tow an hour after Amaryl had left on his way to his shift. She said nothing at all to either Seldon or Dors, but gave a curt nod of her head when they greeted her and gazed sharply about the room as though to verify that the heatsinker had left no trace. She then sniffed the air sharply and looked at Seldon accusingly before marching through the common room into the family bedroom.

Tisalver himself arrived home later and when Seldon and Dors came to the dinner table, Tisalver took advantage of the fact that his wife was still ordering some last-minute details in connection with the dinner to say in a low voice, “Has that person been here?”

“And gone,” said Seldon solemnly. “Your wife was out at the time.”

Tisalver nodded and said, “Will you have to do this again?”

“I don’t think so,” said Seldon.

“Good.”

Dinner passed largely in silence, but afterward, when the daughter had gone to her room for the dubious pleasures of computer practice, Seldon leaned back and said, “Tell me about Billibotton.”

Tisalver looked astonished and his mouth moved without any sound issuing. Casilia, however, was less easily rendered speechless.

She said, “Is that where your new friend lives? Are you going to return the visit?”

“So far,” said Seldon quietly, “I have just asked about Billibotton.”

Casilia said sharply, “It is a slum. The dregs live there. No one goes there, except the filth that make their homes there.”

“I understand a Mother Rittah lives there.”

“I never heard of her,” said Casilia, her mouth closing with a snap. It was quite clear that she had no intention of knowing anyone by name who lived in Billibotton.

Tisalver, casting an uneasy look at his wife, said, “I’ve heard of her. She’s a crazy old woman who is supposed to tell fortunes.”

“And does she live in Billibotton?”

“I don’t know, Master Seldon. I’ve never seen her. She’s mentioned sometimes in the news holocasts when she makes her predictions.”

“Do they come true?”

Tisalver snorted. “Do predictions ever come true? Hers don’t even make sense.”

“Does she ever talk about Earth?”

“I don’t know. I wouldn’t be surprised.”

“The mention of Earth doesn’t puzzle you. Do you know about Earth?”

Now Tisalver looked surprised. “Certainly, Master Seldon. It’s the world all people came from … supposedly.”

“Supposedly? Don’t you believe it?”

“Me? I’m educated. But many ignorant people believe it.”

“Are there book-films about Earth?”

“Children’s stories sometimes mention Earth. I remember, when I was a young boy, my favorite story began, ‘Once, long ago, on Earth, when Earth was the only planet—’ Remember, Casilia? You liked it too.”

Casilia shrugged, unwilling to bend as yet.

“I’d like to see it sometime,” said Seldon, “but I mean real book-films … uh … learned ones … or films … or printouts.”

“I never heard of any, but the library—”

“I’ll try that. —Are there any taboos