The children dispersed, and Martin took Rosa's elbow.

"You don't think I saw it?" Rosa asked as she led them along the hall to the empty C wing.

"I don't know what you saw," Martin said. Then, trying for a joke, "Maybe you saw a mom without makeup."

Rosa looked at him resentfully, sadly, then straightened and pointed to the area of the hall where she had seen the shape. Martin ordered the hall to brighten—wondering why Rosa had not already done the same.

He examined the walls. Never dirty, never dusty, the surfaces within the Ship of the Law cleaned themselves; it was taken for granted by the children. The walls showed no marks.

"I saw scuffs when I came through here," Rosa said.

"It was dark," Martin said.

Quietly, desperately, Rosa began to weep again.

"You could have turned the lights on and seen whatever it was," he said.

"We don't disbelieve you," Theresa said, holding Rosa's shoulder firmly, massaging it with her fingers. "But why didn't you turn the lights on?"

"I was afraid! I didn't want to see it, whatever it was… I didn't want it to see me."

"How big was it?" Martin asked. Dangerous, dangerous.

"It filled this part of the hall," Rosa said, stretching her arms to the ceiling. The hall was two meters wide, marked with blue circles where quarters might be chosen and doors made by the ship on request.

The entire ship had completely adapted itself to deceleration. The circles that had once marked doors in the ceiling and floor had been absorbed by the ship; only circles on the walls remained. Perhaps Rosa had misinterpreted some function of the ship, or seen something nobody else had witnessed.

He tried to express that diplomatically. "The ship usually cleans up or changes when we're not watching; maybe it accidentally allowed you to see something."

"It wasn't part of the ship… I don't think it was," Rosa said. She had lost her tone of hysteria. Her face appeared calmer now, puzzled, and she seemed willing to cooperate, to help them solve the mystery.

"Was it metal, or something else?" Theresa asked.

"It was like a shadow. I didn't see any details. I don't know what it could have been. It seemed alive to me." Rosa folded her arms. Martin saw her as she had been when the journey started, five years before, sixteen and not fully grown, slenderer, with a rugged attractiveness, now become a vulnerable burliness. He wondered again why the moms had chosen her. They had rejected so many others, many Martin had thought were good choices. She swallowed hard, looked, with her large black eyes, more and more lost. "Maybe it wasn't part of the ship. Maybe it doesn't belong here."

"Hold on," Theresa said sternly. Martin was grateful to her for taking a critical tone he dared not use. "We shouldn't jump to any conclusions."

"I saw it," Rosa said, stubbornly defensive.

"We're not questioning that," Theresa said, though Martin certainly thought they should, and she had. "We've all been under a strain lately, and…"

Rosa was turning inward again.

"I saw it. I think it might be important," she said.

"All right," Martin said. "But for now, until we know more, or somebody else sees it, I'd like to keep this quiet."

"Why?" Rosa asked, eyes narrowing. Martin saw more clearly the depth of her problem. She was not going to react well to his next request, but he saw no way around it.

"Please don't talk about it," he said.

Rosa tightened her lips, jaws clenched, eyes reduced to slits, face radiating defiance, but she did not say anything more. "Can I go?" she asked, as if she were a little girl requesting dismissal from class.

"You can go," Martin said. Rosa walked on long, strong legs down the hall toward the central corridor, not looking back. Martin inhaled deeply, held it, watching her like a target, then exhaled when she was too far away to hear.

"Jesus."

"No, I don't think so," Theresa said. She grinned. Martin felt the walls again, as if there might be some mark remaining, some trace of Rosa's shadow.

"I don't think there actually was anything," he said, trying to be extra reasonable, extra careful, even with Theresa.

"Of course not," Theresa said.

"But we shouldn't be toocertain," he said without conviction.

"You think she's… let's not use the word hysterical," Theresa said. "That has the wrong sexual connotations. Let's say stressed out. She's been working up to something. That's what you think? Don't be a hypocrite, Martin. Not with me."

Martin grimaced. "If I tell it like I think it is, we might both reach the wrong conclusions. If I say Rosa is losing it, well… there's evidence, but it's not a sure thing. Maybe she saw a trick of the light. Something we don't know about."

"Ask the War Mother," Theresa suggested. >

That was an obvious first step. "Rosa should ask," he said. "It's her sighting. Let's make her responsible for it."

Theresa touched index finger on one hand to little finger on the other, bent it back until it was perpendicular to the joint, a gesture she sometimes made that fascinated Martin. "Good idea. Do you think she'll keep quiet?"

"She doesn't have many good friends."

"Poor Martin. On your watch, too."

"Maybe it's just a temporary aberration, and she'll pull out of it. Just to be safe—"

Theresa caught his meaning before he expressed it. "I'll have some Wendys keep watch on her."

Martin lowered his hands from the unmarked walls. "Right," he said.

"Maybe Ariel…" Theresa said. "She seems to be the only friend Rosa has."

"We're all friends," Martin said.

"You know what I mean. Don't be obtuse."

Theresa, as their time together lengthened, was becoming more and more critical, more and more judgmental, but in a gentle way, and Martin found that he liked it. He needed another voice now.

There were things he could not directly express, even to Theresa: a growing fear. Rosa expresses it her way. I almost wish I could be so direct.

In the central glow of the schoolroom, the War Mother contemplated Martin's report. They were alone in the large chamber, Martin standing and the War Mother floating, both in a spot of bright light. The doors had closed. Nobody else could hear them. Rosa had refused to go to the War Mother, had seemed insulted they would ask her to. And inevitably, word about her experience had spread.

"No such phenomenon has been noticed within the ship," the War Mother said.

"Rosa didn't see anything?"

"What she saw is not apparent to our sense," the War Mother said.

"Is it possible that we could see something aboard the ship, something with an objective reality, that you would not?"

"The possibility is remote."

"Then it's a psychological problem…" Martin said. And you won't or can't do anything about it.

"That is for you to decide."

Martin nodded, less agitated by such an attitude than he might have been a few tendays before. Other than providing an interface with the ship, the moms did little now. He could issue direct instructions, request direct answers, but critical judgments from their former teachers were not forthcoming. This was independence and responsibility with a vengeance, and he had to complain, however weakly and uselessly.