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It was Reid Malenfant. And he was indeed dying.

Malenfant was wasted. His head was cadaverous, the skull showing through thin, papery flesh, and his bald scalp was covered in liver spots.

Dorothy and Madeleine got Malenfant suited up and hauled him to Dorothy's lander. In this gravity it was hard work, despite their suits' multipliers. But Dorothy's lander had a more comprehensive med facility than Madeleine's. Malenfant had nothing at all, save what the Gaijin had been able to provide.

Malenfant had grown old and had sunk into himself, like a tide going out, an ocean receding. He had managed to keep himself alive a good few years. But his equipment wasn't sufficient anymore -- and the Gaijin he traveled with sure didn't know enough about human biology to tinker. Not only that, he was suffering from the Discontinuity.

When he had started to die, the Gaijin were confounded.

"So they sent for us," Dorothy Chaum said, marveling. "They sent signals out through the gateway links."

"How did they keep him alive so long?"

"They didn't. They just preserved him. They bounced his signal around the Saddle Point network, never making him corporeal for more than a few seconds at a time..."

Madeleine studied Malenfant. Had he been aware, as he passed through one blue-flash gateway transition after another, of the light-years and decades passing in seconds?

Malenfant woke up while they were bed-bathing him. Stripped, washed, and immersed in a med tank, he looked Madeleine in the eyes. "Are you
qualified
to be scrubbing my balls?"

"I'm the best you're going to find, pal."

But now he was staring at Chaum, the diagrammatic white collar around her neck. "What is this, the last rites?" He tried to struggle upright, on arms as thin as toothpicks.

Madeleine shoved him back. "It will be if you don't cooperate."

He swiveled that gaunt head. "Where's my suit?"

Dorothy frowned, and pointed to the Gaijin-manufactured envelope they'd bundled up in one corner. "Over there."

"No," he whispered. "My
suit."

It turned out he meant his old NASA-era Shuttle EMU, a disgusting old piece of kit almost as far beyond its design limits as Malenfant himself. He wouldn't relax until Madeleine got suited up, went across to the lander that had brought him here, and retrieved the EMU for him. Then again, it was the only possession he had in the world, or worlds. She could understand how he felt.

He scrabbled in its pockets until he found a faded, much folded photograph, of a smiling woman on a beach.

When they had him in the tank, Madeleine spent a little time working on that gruesome old suit. She could fix the wiring shorts and the cooling-garment tubing leaks, polish out the scratches on the bubble helmet, patch the fabric. But she couldn't make it absolutely clean again; the dust of many worlds was ingrained too deep into the fabric. And she couldn't wash out the stink of Malenfant.

All the time, visible through the lander's windows, that Gaijin sat on the surface, as unmoving as a statue, watching, watching, as if waiting for Dorothy or Madeleine to make a mistake.

While Malenfant was sleeping off twenty subjective years of traveling, Dorothy Chaum and Madeleine took a walk, across the battered iron plain, toward the yellow sea.

They were each used to solitude, and they were awkward, restless with each other -- and with the notion that they'd been summoned here, given an assignment by the Gaijin. It didn't make for good conversation.

Dorothy was a short, squat woman who looked as if she might have been built for this tough, overloaded gravity. She seemed older than Madeleine remembered; her journey here had absorbed more of her subjective lifetime than Madeleine's had.

They passed the solitary Gaijin sentinel.

"Malenfant calls it
Cassiopeia,"
Dorothy murmured. "He says it's been his constant companion since the Solar System."

"A boy and his Gaijin. Cute."

Dorothy Chaum's personal star quest seemed to be a sublimated search for God. That was how it seemed to Madeleine, anyhow.

"I studied the Gaijin on Earth," Dorothy said. Madeleine could see her smile. "You remember that, on Kefallinia. I got my initial assignment from the Pope... I don't even know if there is a Pope anymore. The Gaijin have some things in common with us. Sure, they are robotlike creatures, but they are finite, built on about the same scale as we are, and they seem to have at least some individuality. But in spite of their similarity -- or maybe because of it -- I was immediately overwhelmed by their strangeness. So I was drawn to follow them to the stars, to work with them."

"And have you discovered yet if a Gaijin has a soul?"

Dorothy didn't seem offended. "I don't know if that question has any meaning. Conversely, you see, the Gaijin seem fascinated by
our
souls. Perhaps they are envious..."

Dorothy stopped dead and held out one hand. Madeleine saw there was some kind of black snow, or a thin rain of dust, settling on the white of her glove palm. "This is carbon," Dorothy said. "Soot. Just raining out of the air. Remarkable."

Madeleine supposed it was.

They walked on through the strange exotic air.

Madeleine prompted. "So you traveled with the Gaijin to try to understand."

"Yes. As I believe Malenfant did."

"And did you succeed?"

"I don't think so. What may be more serious," she said, "is that I don't think the Gaijin are any closer to finding whatever it is
they
were seeking."

They reached the shore of the sea. It was a hard beach, loosely littered with rusty sand and blackened with soot, as if worn away from some offshore seam of coal.

The ocean was very yellow. The liquid was thin, and it seemed to bubble, as if carbonated. Farther out, mist banks hung, dense and heavy. Seeing this garish sea recede to a sharp yellow horizon was eerie.

They stepped forward, letting the liquid lap over their boots. It left a fine gritty scum, and it felt cool, not cold. Vapor sizzled around Madeleine's feet.

Dorothy dipped a gloved finger into the sea, and data chattered over her visor. "Iron carbonyl," she murmured. "A compound of iron with carbon monoxide." She pointed at the vapor. "And
that
is mostly nickel carbonyl. A lower boiling point than the iron stuff..." She sighed. "Iron compounds, an iron world. On Earth, we used stuff like this in industrial processes, like purifying nickel. Here, you could go swimming in it."

"I wonder if there is life here."

"Oh yes," Dorothy said. "Of course there is life here. Don't you know where you are?"

Madeleine didn't reply.

"That's where the soot and the carbon dioxide comes from," Dorothy said. "I think there must be some kind of photosynthesis going on, making carbon monoxide. And then the monoxide reacts with itself to make free carbon and carbon dioxide. That reaction releases energy--"

"Which animals can use."

"Yes."

"There is life everywhere we look," Madeleine said.

"Yes. Life seems to be emergent from the very fabric of the universe that contains us, hardwired into physical law. And so, I suppose, mind is emergent too.
Emergent monism:
a nice label. Though we can scarcely claim understanding..."

They stepped back on the shore and walked farther across the rusty dirt without enthusiasm.

Then they saw movement.

There was something crawling out of the sea. It was like a crab, low and squat, about the size of a coffee table, with a dozen or more spindly legs, and what must be sensors -- eyes, ears? -- complex little pods on the end of flimsy stalks that waved in the murky air. The whole thing was the color of rust.

And it had a dodecahedral body.

Madeleine could hear it wheezing.

"Lungs," Dorothy said. "It has lungs. But... look at those slits in the carapace there. Gills, you think?"

"It's like a lungfish."

The crab was clumsy, as if it couldn't see too well, and its limbs slid about over the bone-hard shore. One of those pencil-thin legs caught in a crack and snapped off. That hissing breath became noisier, and it hesitated, waving a stump in the air.

Then the crab moved on, picking its way over the beach, as if searching for something.

Dorothy bent and, fumbling with her gloved fingers, picked up the snapped-off limb. It looked simple: just a hollow tube, a wand. But there was a honeycomb structure to the interior wall. "Strength and lightness," she said. "And it's made of iron." She smiled. "Iron bones. Natural robots. We always thought the Gaijin must have been manufactured, by creatures more or less like us -- the first generation of them anyway. It was hard to take seriously the idea of such mechanical beasts evolving naturally. But perhaps that's what happened..."

"What are you talking about?"

She eyed Madeleine. "You really don't know where you are? Didn't the Gaijin tell you?"

Madeleine had an aversion to chatting to Gaijin. She kept her counsel.

"This iron world is Zero-zero-zero-zero, Madeleine," Dorothy said. "The origin of the Gaijin's coordinates, the place their own colonization bubble started.
The place they came from.
No wonder they brought Malenfant here, if they thought he was goingto die."

Madeleine felt no surprise, no wonder, no curiosity.
So what?
"But if that's so, where are they all?"

Dorothy sighed. "I guess the Gaijin are no more immune to the resource wars, and the predatory expansion of others, than we are."

"Even the Gaijin?"
The notion of the powerful, enigmatic, star-spanning Gaijin as victims was deeply chilling.

"If this is a robotic lungfish," Dorothy said, "maybe life here got pushed back into the oceans by the last wave of visitors. Maybe this brave guy is trying to take back the land, at last."

The crab thing seemed to have reached its highest point, attained the objective of its strange expedition. It stood there on the rusty beach for long minutes, waving those eyestalks in the air. Madeleine wondered if it even knew they were here. If it recognized the Gaijin as its own remote descendant.

Then it turned and crawled back into the yellow ocean, step by step, descending into that fizzing, smoky liquid with a handful of bubbles.

"The Gaijin are not like us," Malenfant whispered. He was sitting propped up by cushions in a chair, wrapped in a blanket. He was bird-thin. They had had to bring him back to his own lander; after so long alone he had gotten too used to it, missed it too much. "Cassiopeia is constantly in flux," he said. " 'Cassiopiea' is just the name I gave her, after all. Her
own
name for herself is something like a list of catalog numbers for her component parts -- with a breakdown for subcomponents --
and
a paper trail showing their history. A manufacturing record, not really a name. She constantly replaces parts, panels, internal components, switching them back and forth. So her name changes. And so does her identity..."

"Your
cells wear out, Malenfant," Dorothy said gently. "Every few years there is a new you."

"But not as fast as
that.
It's the way they breed, too -- if you can call it that. Two or more of them will donate parts, and start assembling them, until you get a whole new Gaijin, who goes off to the storeroom to get the pieces to finish herself off. A whole new person. Now, where does
she
come from?" He sighed. "They have continuity of memory, consciousness, but identity is fluid for them: You can divide it forever, or even mix it up. You see it when they debate. There's no persuasion, no argument. They just...
merge...
and make a decision. But the Gaijin are cautious," he said slowly. "They are rational; they consider every side of every argument; they sometimes seem paralyzed by indecision."

"Like Balaam's ass," Dorothy said, smiling. "Couldn't decide between two identical bales of hay."

"What happened?" Madeleine asked.

"Starved to death."

Malenfant went on, as if talking to himself. "They aren't like us. They don't glom onto a new idea so fast as we do--"

"Their minds are not receptive to memes," Dorothy said. "They have no sense of self--"

"But," Malenfant said, "the Gaijin are
interested
in us. Don't know why, but they are. And creatures
like
us: religious types, folks who mount crusades and kill each other and even sacrifice their lives for an idea."

Madeleine remembered the Chaera, orbiting their black-hole God, futilely worshiping it. Maybe Nemoto had been right; maybe it hadn't been black-hole technology the Gaijin were interested in, but the Chaera themselves. But why?

Dorothy leaned forward. "Have the Gaijin ever talked about creatures like us? What becomes of us?"

"I gather we mostly wipe ourselves out. Or think ourselves to extinction. Memes against genes. That's if the colonization wars don't get us first." He opened his rheumy eyes. "Earth, the Solar System, might be swept aside by the incoming colonists. It's happened before, and will happen again.
But it isn't the whole story.
It can't be."

Dorothy was nodding. "Equilibrium. Uniformity. Nemoto's old arguments."

Madeleine didn't understand.

Malenfant smiled toothlessly at her.
"Why
does it have to be this way? That's the question. Endless waves of exploitation and trashing, everybody getting driven back down to the level of pond life... You'd think somebody would learn better. What stops them all?

"If what stopped an expansion was war, you'd have to assume that there are
no
survivors of such a war -- not a single race, not a single breeding population. Or, if intelligent species are trashed by eco collapse, you have to assume that
every
species inevitably destroys itself that way.