Crowe spent the night in the flat.

  Not sleeping — working. He had arrived from the Academy shortly before six in the evening, put his coat on the chair, stood before the corkboard for a moment, and then done something he rarely did: he took everything down.

  He didn't throw it away. He organised it in a pile on the table, in chronological order, and started again.

  It was the process he used when he realised he had built on a wrong foundation. There was no shortcut — he had to dismantle down to the foundations and reassemble using only what was real, discarding what had been premature inference dressed as conclusion.

  It took until shortly after midnight.

  What was real, without additional interpretation:

  A factory with unauthorised nocturnal access. A chamber illegally constructed within the structure. An improvised laboratory producing a chemical compound with amnesic effects. Time clocks modified to falsify attendance records. Six workers with compromised memory of specific shifts.

  Human crime. Motivation not yet confirmed but with a clear shape — nocturnal use of the factory to produce an illegal chemical substance, covered by falsified records and the erased memory of any worker who might have seen or heard something.

  That was the case. Simple. Solvable.

  What he had added on top of it:

  The connection to the interval. The theory that Vex was trying to send people into the phenomenon. The fusion between Vex's work and Voss's disappearance.

  All of that had been inference built on the Voss case — which was on the corkboard, which was in his head, which had been in every thought since Ironmongers' Street. He had arrived at the factory case already contaminated and had fitted what he found into a mould that already existed.

  The difference between what was real and what he had added was precisely the difference between investigation and the desire for pattern.

  Crowe looked at the empty corkboard for a moment.

  Then he began to repopulate it. Only with what was real.

  At seven in the morning he went to the Guard.

  Maren was in his office with the door open and a cup of coffee that appeared to have been forgotten long enough to be cold. He looked up when Crowe entered and kept his eyes up for a second longer than usual — the kind of attention that meant he had noticed something and was deciding whether to ask.

  He didn't ask.

  Crowe sat in the visitor's chair.

  — The factory case has two parts — he said. — One is a human crime with a mechanical explanation. The other is a phenomenon that doesn't belong to this case.

  Maren was quiet.

  — I had been merging the two — said Crowe. — I shouldn't have done that.

  That was all. No further elaboration, no contextualisation, no qualification. It was the admission in its most compact form and Maren knew it and Crowe knew that Maren knew.

  The inspector picked up the cold cup of coffee, looked at it, put it back on the desk.

  — Vex — he said. As though the previous conversation had not happened, which was exactly the kind of courtesy that made Maren tolerable.

  — Vex is the crime — said Crowe. — He is using the factory to produce and probably sell the compound. The original motivation may have been research — but what he is doing now is an illegal operation using a product that impairs the memory of subjects without consent. Which he has done before and was dismissed for.

  — Selling to whom.

  — I don't know yet — said Crowe. — But the folder I found at the lodging house had a list of names with markings suggesting test subjects. If he is selling, the buyer wants the product tested and documented. That suggests a buyer with resources and a specific purpose.

  — The list — said Maren. — I'd like to see it.

  Crowe took the folder from his coat and placed it on the desk. Maren opened it. Read in silence.

  He stayed on the page for a moment.

  — Voss is here — he said.

  — He is.

  — And Reed.

  — He is.

  Maren closed the folder slowly. He looked at Crowe with the expression that appeared when he was processing something that altered the map of a case.

  — If Voss is on Vex's list of subjects — he said, slowly — then Vex knew about Voss before the disappearance.

  — He did — Crowe confirmed. — But he didn't cause the disappearance. Voss disappeared in the manner of the twenty-three before him — without a compound, without Vex's intervention. Vex had identified him as a subject of interest because of his natural sensitivity to the phenomenon. He had been planning to use him. But the phenomenon got there first.

  This tale has been unlawfully lifted from Royal Road; report any instances of this story if found elsewhere.

  Maren was quiet for a moment.

  — Are you certain of that — he said. In a voice that was not a challenge — it was genuine verification.

  Crowe was quiet for a second too.

  — I am — he said. And this time it was different from the certainty of the day before — not the certainty of a theory fitted into place by force. It was the certainty of a structure tested against what was real and that had survived the test. — The two processes are parallel. Independent. Vex is human crime. The interval is something else.

  Maren nodded once. Slowly.

  — Then we resolve the human crime — he said. — And you resolve the other thing.

  It was a division of labour that had existed implicitly since the Voss case and that neither of them had put into words until now. Saying it aloud carried a different weight.

  Crowe stood.

  — Vex left the lodging house two days ago with a bag — he said. — That may have been a sign that the investigation was getting close — the folder left under the bed may have been deliberate, left to slow things down. Or the timing may have been coincidence. Either way he is in motion. He needs somewhere to continue the work.

  — Another space like the factory chamber — said Maren.

  — With the same characteristics — said Crowe. — Discreet access, a structure that allows equipment installation, proximity to a power source for the heating apparatus. — He paused. — And a connection with someone who can provide that space. Vex didn't build the chamber alone — he needed someone with access to the factory and the willingness not to ask questions.

  — Manager Harwick says he knew nothing — said Maren.

  — Harwick knew nothing — Crowe confirmed. — But someone did. Someone with sufficient access for Vex to operate for eighteen months undetected. — He went to the door. — The staff list Harwick sent — I need to look at it specifically for whoever has access to the hydraulic press area outside operating hours.

  — It's already on my desk — said Maren. He took a folder from the pile on his right and held it out. — I came in early.

  Crowe took the folder. Opened it standing.

  There were seventeen names with documented access to the press area. Crowe read them once, then returned to the fifth name.

  Aldous Crane — senior steam equipment maintenance technician. Unrestricted access to the press sector. Harwick tenure — twenty-three years.

  Twenty-three years of tenure. Unrestricted access. The kind of presence that becomes invisible through familiarity — no one questions the senior technician who has always been there.

  — Crane — said Crowe.

  Maren stood without needing to ask why.

  Aldous Crane lived fifteen minutes from the factory in a two-storey townhouse that had the appearance of a place where decisions were made with care and consequences were endured with resignation. The door was closed. The ground-floor curtains were drawn.

  Maren knocked with the particular authority of someone who represents an institution and knows it.

  Silence. Then footsteps. Then a pause before the door opened that was too long to be natural.

  The man who opened it was sixty years old with the build of someone who had worked with his hands all his life — broad shoulders, hands with the specific calluses of heavy tool work, the slightly stooped posture of someone who spends years bent over equipment at an uncomfortable height. Brown eyes that saw Maren, saw Crowe, and demonstrated, in the first two seconds, an amount of information that confirmed what Crowe had already concluded.

  Crane knew why they were there.

  — Mr. Crane — said Maren. — We need to speak about the chamber in the press sector at Harwick.

  Crane stood still for a moment. Then stepped back and let them in with the gesture of someone who had rehearsed several possible responses to this moment and had decided, when it arrived, that none of them was worth the effort.

  The conversation lasted forty minutes.

  Crane had met Vex two years before the chemist was hired at Harwick — in a tavern in the Industrial District where the two had been introduced by a mutual acquaintance whose name Crane provided without resistance. Vex had presented the project as legitimate scientific research, had paid well for the access, had promised that the workers would not be permanently harmed.

  — He said it was only short-term memory — said Crane, in the voice of someone who knew that wasn't sufficient but had decided it was. — That it left no mark. That the men would be fine.

  — And they were — said Crowe. Not as absolution. As a data point.

  Crane looked at him.

  — But the fact that it leaves no permanent mark doesn't make the act legal or ethical — said Crowe. — And you knew that when you agreed.

  Crane didn't answer. That was the answer.

  Maren did what was necessary. There were two guards waiting outside — he had learned, over the years, that Crowe rarely needed reinforcement but that it was prudent to have it available. Crane was taken without resistance, with the particular resignation of someone who had been waiting for the weight he carried to arrive somewhere.

  Vex was found three hours later.

  Not through elaborate investigation — by Maren, who had sent guards to every unoccupied industrial space in the District with the characteristics Crowe had described, and who at the fourth address found a forty-year-old man with laboratory equipment half-packed in a large bag and the expression of someone who had miscalculated the time available to disappear.

  Crowe was not present at the capture. He was in the flat, before the reconstructed corkboard, when Maren sent the note with two words: Found. Vex.

  He read the note. Set it on the table.

  The case was resolved. The human crime had a perpetrator, had evidence, had documented motivation. The time clocks would be restored, the workers would be examined by Pell to confirm the absence of permanent damage, the chamber would be demolished.

  It was a clean conclusion.

  Crowe looked at the corkboard for a moment. At the fragments of Case 001 that had returned to the right side — cases in development — and at the empty space where the wrong theory had stood for days before being dismantled.

  The headache had passed. It had passed in the early morning, when he had finished rebuilding the case on honest foundations, as though the effort of forcing connections that didn't exist had carried a physical cost that dissolved when the effort ceased.

  That was a data point he wasn't sure how to interpret.

  He filed it for later.

  Maren appeared at seven in the evening with the final report under his arm and a bottle of something amber that he set on Crowe's desk without asking permission.

  — Closed — he said, sitting in the visitor's chair with the weight of someone who had had a long day and had reached the end of it. — Vex is in custody. Crane too. The buyer Vex was supplying is still being identified — there was an intermediary, it will take a few days.

  — The buyer will lead somewhere else — said Crowe.

  — Probably — said Maren. — But that's not your case.

  Crowe looked at the bottle. Maren had brought two glasses that he took from his coat pocket with the ease of someone who had planned this.

  — You noticed — said Crowe.

  Maren poured both glasses without answering immediately.

  — I noticed you spent three days looking for the wrong problem — he said, with the voice of the kind of honesty that only exists between people who respect each other enough not to pretend. — And then spent a whole night correcting it. — He handed over one of the glasses. — That's more than most do.

  Crowe took the glass.

  There was nothing more to say about it and both of them knew it. They drank in silence for a moment with the sounds of Londrivar coming through the window — the steam, the gears, the distant whistle of a rail carriage.

  — Thomas Reed — said Crowe.

  — He's fine — said Maren. — Examined by a Guard physician. No permanent physical damage. — A pause. — The earth on his knees was never explained.

  — No — said Crowe.

  — You have a theory.

  — I have a question — said Crowe. Which was different, and Maren was one of the few who understood the difference. — It's not a theory yet.

  Maren nodded. Drank.

  The bottle stayed on the table and the two sat in a silence that didn't need filling, while Londrivar did its work outside of appearing normal and hiding the rest.