Lise shrank a little every time they passed another vehicle, but Turk drove cheerfully once they were back on the paved roads, a cloth cap pulled low over his eyes, humming to himself. Ibu Diane sat patiently, watching the world scroll past.

Lise decided to break Diane's silence. She turned her head and said, "Tell me about Avram Dvali."

"It might be easier if you told me what you already know."

"Well—he taught at the American University, but he was secretive and not especially well-liked by the faculty. He left his teaching position without an explanation less than a year before my father vanished.

Someone at the chancery office told me his last paycheck had been forward by letter mail to a box address in Kubelick's Grave. According to my mother," at least on the rare and emotionally difficult occasions when Lise had pressed her to talk about the past, "he visited the house several times before he quit his job. There's no listed address for him in Kubelick's Grave, but a search on his name didn't turn up any contemporary address, anywhere. I meant to go to Kubelick's Grave and see if the box address still worked or if there was any record of who had rented it. But it seemed like a long shot."

"You were very close to something you didn't understand. I'm not surprised Genomic Security took an interest in you."

"So Dvali was involved in one of these communicant cults."

"Not involved in it. It was his. He created it."

Dvali, she said, had taken his Fourth treatment in New Delhi years before he emigrated to the New World. "I met him not long after he was hired by the university. There are literally thousands of Fourths in the area around Port Magellan—not including those who choose to live out their extended lives quietly and in isolation. Some of us are more organized than others. We don't hold conventions, for obvious reasons, but I meet most of the known Fourths, sooner or later, and I can sort out the cliques and subgroups."

"Dvali had his own group?"

"So I gather. Like-minded people. A few of them." She hesitated.

"We're called Fourths, you know, because on Mars the treatment is equivalent to entering a fourth stage of life, an adulthood beyond adulthood. But the treatment doesn't guarantee any special maturity. That's built into the institutions surrounding it as much as into the treatment itself. Avram Dvali brought his own obsession into his Fourthness."

"What obsession?"

"With the Hypothetical. With the transcendent forces of the universe. Some people chafe at their humanity. They want to be redeemed by something larger than themselves, to ratify their sense of their own unique value. They want to touch God. The paradox of Fourthness is that it's a magnet for such people. We try to contain them, but—" She shrugged. "We don't have the tools the Martians put in place."