Source Unknown

The first rule of contamination analysis was to find a clean control. The second was to admit when there might not be one.

Ivo Chen arrived at the release office with a backpack, two packets of crisps and the expression of a man delighted to have been invited into a disaster that was not technically his responsibility.

"I was told retirement from Morrow would involve less Morrow."

"You work for a company auditing Morrow," Elias said.

"Yes, but spiritually I expected distance."

Ivo had grown his hair longer since leaving. He also wore a wedding ring now, which Elias had noticed three months earlier and forgotten to ask about until Mara scolded him.

They set up in a secure analysis room with no network access except the court archive. Celia provided fifty anonymized reconstruction bundles, stripped of identities but retaining source lineage. Ivo wrote scripts to compare rendered features against donor libraries.

The first match took eleven minutes. Client 18-F had reconstructed a grandmother buttoning a child's coat. The hand motion came seventy-one percent from a donor in Scotland who was not related to the client.

The second involved a father's laugh. The third, a kitchen light fixture.

By evening they had thirty-two probable cross-donor transfers.

"Some of these are harmless," Ivo said.

Mara, who had brought sandwiches and then stayed, looked over his shoulder. "Define harmless."

"A generic reach movement learned from lots of people isn't psychologically meaningful. That's how machine learning works."

"My mother's broken finger is not generic."

"Agreed. That's the line we're trying to find."

Elias watched source weights scroll down the screen.

"The problem is that the line moves depending on the person."

Ivo nodded. "A lamp can be generic until it's the lamp somebody remembers their father fixing the night before he died." They worked until the station announcements below became infrequent.

At 9:18, Ivo stopped typing.

"That's weird."

Nobody liked that sentence from an engineer.

"What?" Elias asked.

Ivo pointed to a source lineage record. One reconstruction contained a phrase with no donor attribution.

Most generated dialogue had traceable components: direct audio, written text, linguistic model inference, donor prior. This one said SOURCE UNKNOWN.

"Could be corrupted metadata," Elias said.

"Could be."

"What phrase?"

Ivo opened the redacted transcript. A reconstructed father was speaking to his adult daughter in a hospital corridor.

You do not have to remember me correctly to have loved me. Mara stopped eating.

Elias felt an immediate, unpleasant familiarity.

"Have you heard that?" Ivo asked.

"No."

Mara said, "Yes." Everyone turned.

She put the sandwich down.

"Where?" Elias asked.

"Fallow. Lena said something like it once. Not exactly."

"When?"

"After I complained about June's reconstruction. She told me factual error didn't automatically erase emotional truth."

"That's not the same sentence."

"I know."

Ivo searched the phrase across the archive. Seven matches.

Seven unrelated clients had encountered variations of the same line. None had direct source attribution.

Elias looked at the timestamps. The earliest was 2011.

The latest 2025.

"Model-generated comfort phrase," Ivo said. "Probably a template embedded in old dialogue priors."

"Then why source unknown?"

"Bad migration."

"You don't believe that."

Ivo sighed. "I believe software is capable of being boring in ways that look sinister." Mara leaned closer to the screen. "Search one more phrase."

"What?"

She hesitated.

"If I disappear, don't let them tell you I was sick."

Elias turned sharply. "Mara."

"We know it's mine. Search it."

Ivo did. The exact phrase returned one record.

Mara's 2011 video. Elias exhaled.

Then Ivo removed the word sick and searched semantic similarity. Fourteen records appeared.

If I leave, don't let them make me ill. If I'm gone, don't believe them when they say I wasn't well.

If I disappear, don't believe the diagnosis. Different clients.

Different years. Different families.

Mara stared at the screen.

"Those could be coincidence," Elias said.

She looked at him. "You don't believe that." He didn't.

Ivo opened the earliest record. 2010.

A year before Mara's recording. A teenage boy in a Fallow trial had reconstructed his mother saying:

If I'm gone, don't let the doctors decide what I meant. Mara sat back.

"Then maybe my sentence wasn't first."

Elias thought of how long one line had defined both their lives. He had finally learned it was real.

Now he had to ask where it came from.

Ivo's clean-control problem followed Elias home. He found himself standing in front of his own bookshelf trying to decide which memory in the room had never passed through a Morrow system, a police interview, a family retelling or one of his notebooks. The answer was probably many of them. Yet the question had made ordinary certainty feel contaminated.

He took down an old paperback from university. A receipt fell from between the pages. October 2011. Aster Cafe. Black coffee and almond biscuit.

He had seen the transaction before, during the investigation into Mara's kitchen memory. This receipt was physical, folded and stained. It should have felt stronger than database evidence. Instead he noticed that he could not remember putting it in the book.

There was a knock at the door.

Lena stood outside carrying a paper bag. "Mara said you've eaten badly for two days."

"Mara exaggerates."

"She said you had coffee for breakfast and forgot lunch."

"That is technically two things."

Lena walked in without asking and put soup on the counter. She saw the receipt in his hand.

"What are you testing?"

"Nothing."

"You hold evidence differently when you're testing it."

He almost asked how she knew, then remembered how many clinical sessions she had observed years earlier. The thought still created a small pressure behind his ribs.

"Ivo says we need a clean control," Elias said.

"For the technical analysis. Not for your life."

"Convenient distinction."

Lena took off her coat. "Elias, there has never been a clean control for a human memory. Parents tell stories. Photographs change emphasis. People repeat jokes until nobody remembers who started them. Morrow industrialized something that already existed. That does not make the industrial version harmless, but it also does not mean every influence is corruption."

"That's exactly the kind of sentence Rohe would use."

"Rohe would use it to reduce responsibility. I'm using it to stop you from treating influence as annihilation."

He looked back at the receipt. "If I remember Rebecca taking half the biscuit because I saw the transaction record, what is that memory?"

"I don't know."

"Helpful."

"You hired me for accuracy, not morale."

He had not hired her. Neither of them mentioned that.

They ate at the small table near the window. Lena described three claimant cases she had reviewed that afternoon. One woman had recognized a lullaby from her reconstruction as something her real mother had never sung. She still wanted to keep the scene because it helped her speak about a childhood she had otherwise avoided. Another claimant wanted every inferred frame destroyed. A third refused to learn which details were borrowed.

"There won't be one ethical answer," Lena said.

"Institutions hate that."

"People hate it too."

After she left, Elias returned the receipt to the book but changed the page. Not because page number mattered. Because he wanted to know later whether he had moved it. He wrote the new page on paper and immediately became annoyed with himself.

Then he laughed.

A clean control was impossible. But an honest record of uncertainty was not.

He left the receipt where it was and went to bed without checking it again.