"On the other side of the System."

"Right. There's no way either of those ships could reach us for, I'd say, a year."

We only have a month's supplies. A bubble of panic gathered in Lvov's stomach.

"Do you get it yet?" Cobh said heavily. "We'll be sacrificed, if there's a chance that our rescue would damage the new ecology, here."

"No. It wouldn't happen like that."

Cobh shrugged. "There are precedents."

She was right, Lvov knew. In the case of the "tree stump" life-forms discovered on a remote Kuiper object, the territory had been ring-fenced, the local conditions preserved, once life -- even a plausible candidate for life -- was recognized.

Cobh said, "Pan-genetic diversity. Pan-environmental management. That's the key to it; the public policy of preserving all the species and habitats of Sol, into the indefinite future. The lives of two humans won't matter a damn against that."

"What are you suggesting?"

"That we don't tell the inner System about the flakes."

Lvov tried to recapture her mood of a few days before: when Pluto hadn't mattered to her, when the crash had been just an inconvenience. Now, suddenly, we're talking about threats to our lives, the destruction of an ecology.

What a dilemma. If I don't tell of the flakes, their ecology may be destroyed during our rescue. But if I do tell, the GUTship won't come for me, and I'll lose my life.

Cobh seemed to be waiting for an answer.

Lvov thought of how Sol light looked over Pluto's ice fields, at dawn.

She decided to stall. "We'll say nothing. For now. But I don't accept either of your options."

Cobh laughed. "What else is there? The wormhole is destroyed; even this flitter is disabled."

"We have time. Days, before the GUTship is due to be launched. Let's search for another solution. A win-win."

Cobh shrugged. She looked suspicious.

She's right to be, Lvov thought, exploring her own decision with surprise. I've every intention of telling the truth later, of diverting the GUTship, if I have to.

I may give up my life, for this world.

I think.

In the days that followed, Cobh tinkered with the GUTdrive, and flew up to the Interface to gather more data on the Alcubierre phenomenon.

Lvov roamed the surface of Pluto, with her desk set to full record. She came to love the wreaths of cirrus clouds, the huge, misty moon, the slow, oceanic pulse of the centuries-long year.

Everywhere she found the inert bodies of snowflakes, or evidence of their presence: eggs, lidded burrows. She found no other life-forms -- or, more likely, she told herself, she wasn't equipped to recognize any others.

She was drawn back to Christy, the sub-Charon point, where the topography was at its most complex and interesting, and where the greatest density of flakes was to be found. It was as if, she thought, the flakes had gathered here, yearning for the huge, inaccessible moon above them. But what could the flakes possibly want of Charon? What did it mean for them?