Vessa Fenn opened the door only after Sera had knocked three times and announced that she was not from the College.
“You were from the College,” Vessa said.
“That was fifteen years ago.”
“And the door remembers.”
The water-testing station occupied a small platform above a settling tank. Pipes fed three shallow basins, each marked with a different chalk line. A row of jars stood on the windowsill, filled with water ranging from clear to the color of weak tea. Vessa was a narrow woman with gray curls pinned up in a hurry and ink on two fingers. She looked at Iven, then at Sera’s case.
“Who’s he?”
“Iven Marr. He repairs things.”
“Does he also ask questions?”
“Yes,” Iven said.
“Then he can wait outside.”
Sera folded her arms. “I brought the old test copies.”
Vessa’s expression changed, though not much. “You kept them?”
“I kept what I could.”
“And now you want me to tell you they were right.”
“I want you to tell me what you saw.”
Vessa looked past them at the walkway. A cart of empty jars rattled toward the next station. Its driver waved. She waved back, then stepped aside.
“Both of you. Wipe your boots.”
Inside, the station smelled of damp stone and vinegar. A narrow bench held glass dishes, measuring spoons, and a small hand-operated pump. Vessa cleared a space and spread a clean cloth. Sera placed the two sealed sample packets on it.
“Not those yet,” Vessa said. “The old pages first.”
Sera opened the packet. Vessa read in silence, occasionally turning a page toward the light. She stopped at the entry describing a repeated impact and a reduced response under the regulator.
“This was mine,” she said. “The second test was less clear because the tissue had been cut twice. I wrote that the condition had changed.”
“Was the third test removed?” Iven asked.
“Yes. I removed it.”
Sera looked up. “Why?”
“Because the instrument slipped. The record said the same force had been applied, and it hadn’t. I marked it invalid. Someone recopied the page without the explanation.”
“Can you show us the original?”
“I don’t have it. I wrote the correction in the laboratory book.”
Sera closed her eyes briefly. “I should have asked you.”
“You should have. You didn’t.” Vessa tapped the page. “That doesn’t make the first result meaningless. It means you can’t use the third one.”
Iven appreciated the distinction. It was a smaller answer than the mystery invited, but it was an answer that could be checked.
“What did you think the tissue was doing?” he asked.
“I thought the contractions had a pattern. I didn’t know whether the pattern came from the injury, the regulator, or the larger body. I asked for a longer observation.”
“And I argued we needed to treat the tear,” Sera said.
“You were right about the tear. You were wrong to say the question could wait indefinitely.”
“I know.”
Vessa studied her. “Do you?”
“I left the work before I understood how far the valve had been adopted.”
“You left after they stopped letting you ask.”
“I also stopped asking some questions myself.”
Vessa did not answer immediately. She took a jar from the windowsill and poured clear water into a dish. “Show me the new samples.”
Sera opened the first packet. The material from the doorframe had formed a thin, dry skin. The drill sample had a thicker surface, with a softer layer beneath. Vessa cut a sliver from each and placed them in separate dishes. She added measured drops of water, then watched.
The dry skin curled. The softer material absorbed the water and swelled slightly.
“Could be a gel,” Vessa said. “Could be tissue. Could be several things mixed together.”
“Does the reaction suggest it’s alive?” Iven asked.
“It suggests it absorbs water. A sponge does that too.”
She put one sample near the small pump and drew air through a narrow tube over its surface. The skin dried faster. She covered it again and marked the time on a slate.
Iven examined the dish without touching it. Tiny pale strands ran through the material. Some appeared to connect to the outer skin, but he could not tell whether they were fibers, cracks, or something else.
“Do you have a magnifying lens?” he asked.
Vessa handed him one. Under the glass the strands looked more regular, branching at intervals. He described what he saw. Vessa checked his description, then adjusted the lamp and looked again.
“Those may be channels,” she said. “They may also be marks from the cloth. The sample was pressed against a fabric pad?”
“Yes,” Sera said.
“Then we need an untouched piece.”
“We can’t safely take one from the wall without damaging it.”
“Do you have anything the creature left behind?”
Sera took out Kesh’s wrapped fragment. Vessa examined it without removing the cloth completely. Its ridged underside matched the shape of the damaged wall.
“This might help. Where was it found?”
“Beside the drill hole after the creature left.”
“Did anyone see the creature deposit it?”
“Kesh saw it press against the hole. She didn’t see this piece come away.”
“Then we record both facts.” Vessa cut a tiny shaving from the edge, leaving the rest intact. “I can compare the structure. I can’t tell you the creature’s intention from a fragment.”
Vessa asked him to describe the creatures without using the words guardian, attacker, or healer.
“Pale plates,” he said. “Low body. Several limbs. The larger one had a broken shoulder plate. It pushed through a doorway, struck the frame, and then touched a fresh crack in the wall.”
“What did it do when you moved?”
“It struck the brace I put between us, then returned to the crack.”
“What did you do before it struck?”
“I moved the brace toward it.”
“Then it may have answered your movement. What did the other people do?”
“Kesh made a sound with her spear. Tavin dragged a table. Neri supported the ceiling. Sera covered the first cut.”
“All at once?”
“Close enough.”
Vessa wrote a short list. “That’s a difficult observation. The creature had several things to respond to, and you were trying not to get hurt.”
“You make that sound like a flaw.”
“It would have been a worse flaw to stand still and let it break your arm. But when you describe the event, include the other movements. Someone reading a year from now won’t know what you left out.”
Sera added the list to Kesh’s earlier notes. “We can mark the order of events.”
“Where you remember it,” Vessa said. “Don’t invent the order where you don’t.”
Iven tried to recall whether the creature had touched the crack before or after Tavin moved the table. He thought he knew, then realized he had been looking at Neri when the sound began. He told Vessa that. She wrote the uncertainty beside the observation.
“Does that make the notes less useful?” he asked.
“It makes them honest. An honest gap is useful to the next person who can fill it.”
Iven waited while she worked. The pump clicked at a steady pace. Outside, someone opened a valve and water rushed through the settling tank. Vessa adjusted a basin without looking away from the sample, then sent Iven to close the valve when it threatened to overflow.
He found the wheel stiff. The threads had gathered mineral scale. He loosened it a little, cleared the obstruction with his awl, and turned it until the water slowed. He did not claim an imprint from the work; the valve had not been broken, only poorly maintained.
When he returned, Vessa was holding the magnifying lens between the two dishes.
“The strands in the fragment are not the cloth pattern,” she said. “They’re finer, and they branch. The fresh sample has something similar. That’s a reason to investigate, not a verdict.”
Sera wrote the observation. “Would you sign it?”
“I’ll sign what I observed. I won’t sign your conclusion.”
“I haven’t written one.”
“Good.”
Vessa took the pencil and added her name. Iven signed as a witness to the test, not as a medical expert. He made sure the distinction appeared beside his signature.
“Do you think the creature repairs the wall?” he asked.
“I think you saw it press material against a damaged place. I think this material may share a structure with the fluid from that place. You need more observations before you know what the creature does with it.”
Sera nodded. “That’s what I wanted to know.”
“No. You wanted me to say you were right.”
“I wanted that too.”
Vessa’s mouth twitched. “At least you’ve improved at admitting it.”
They left after agreeing that Vessa would keep a portion of each sample and Sera would keep the remainder. Copies of the observation went with both women. If one set was lost or altered, the other would still exist.
On the walkway, Sera stopped at the rail. Below them, the settling tank reflected a pale strip of sky. Workers crossed a lower bridge with baskets of filter cloth. One basket leaked dust, and its carrier stopped to tie the seam before continuing.
“You asked whether I liked you,” Sera said.
“I asked whether I’d decided.”
“What have you decided?”
“That you made a device for a useful purpose, learned it was being used for something else, and waited too long to challenge it.”
“That’s accurate.”
“I also decided you brought me the drawing when you could have kept it to yourself.”
“Vessa might have told you.”
“Eventually.”
Sera rested her hands on the rail. “I don’t want you to follow me because I sound certain.”
“That’s fortunate. You don’t sound certain very often.”
“I want you to check my work.”
“I intend to.”
“And if you find I’m wrong?”
“I’ll tell you.”
She looked at him. “Good.”
They returned to the clinic by way of the market. Iven bought two rolls from a baker and offered one to Sera. She took it, then divided it with a child waiting beside the stall. The child thanked her and ran toward a woman sorting onions.
“Do you know them?” Iven asked.
“No.”
“Then why half?”
“She looked hungry.”
“Perhaps she wanted the whole roll.”
“Perhaps. I wanted some too.”
At the clinic, Kesh waited with a drawing of tracks from the drainage passage. She had marked where the creature approached the fresh hole, where it turned, and where it left. One set of tracks crossed another.
“Two visits,” she said. “At least. I can’t tell whether it’s the same animal.”
Vessa’s signed observation went beside the drawing. Sera explained what the material might show and what it did not. Kesh listened without disappointment.
“Then we need to watch without making a new cut,” she said.
“Can you?” Iven asked.
“I can try. The guard will need to let me near the drain.”
Neri arrived with the transport-board contract. The support crew would enter the following morning, accompanied by the engineer. Kesh could observe from the junction if she stayed clear of the work. Elian had obtained permission to compare the old route map with the passage, provided a guard remained present.
“That’s more permission than I expected,” Iven said.
“It’s less freedom than I wanted,” Neri replied. “We’ll use it.”
Sera looked at the contract, then at the samples. “The regulator housing is close to the planned support. We can ask the engineer to inspect it.”
“We can ask,” Neri said. “We won’t open it without understanding the load.”
Iven studied the drawing from Sera’s old work. The small valve had become part of a larger machine. The next step was not to condemn the drawing or trust the machine. It was to see how the parts were connected and what would happen if anyone touched them.
He folded the copy and put it in his coat. “Tomorrow, then.”
Sera began clearing the table. Iven helped her stack the dishes. One had a crack at the rim. He set it aside for repair, and she caught him looking at it.
“Not everything has to be fixed tonight,” she said.
“I know.”
“Do you?”
He placed the dish on the shelf. “I’m practicing.”