The cabin had been constructed in eleven days.
Jonas had not supervised the construction personally — the Duke's estate had sufficient skilled labor that supervision was a misallocation of his time, and the blueprints were detailed enough that competent builders did not require hand-holding. What he had supervised was the installation: the pipe network running from the external steam engine to every outlet in the building, the pressure regulation mechanism that prevented the system from delivering water at a force that would be startling rather than useful, the heat exchanger that allowed the engine's thermal output to warm both the water supply and, through a secondary circuit running beneath the floor and through wall-mounted radiators, the air inside the cabin itself.
The cabin was modest in scale — one main room with a bathing chamber to the rear, a smaller anteroom at the front. What it contained was not modest. A steel bathtub, deep enough to be functional, fed by two taps — one for hot water, one for cold, the mixing of which was the user's own determination. A shower head mounted above a drainage basin, operating on the same supply. Two sinks, one in the bathing chamber, one in the anteroom, each with its own tap set. A toilet connected to a drainage system that ran to a sealed collection point forty feet from the building. And along the interior walls, at intervals calculated for even heat distribution, the radiators — flat steel panels fed by the secondary hot water circuit, warm to the touch, warming the air around them with the steady, patient consistency of something that did not know how to stop.
The fireplace in the cabin's main room had been deliberately left unlit.
The cabin was warm anyway.
The Duke entered first, as was appropriate, and stood in the main room for a moment before moving further inside. He was followed by Griselda, who came through the door with her walking stick and stopped two paces in with the expression of a woman who had prepared herself for something impressive and was revising her preparation upward. Elsa and Hans came in behind her, then Mikayla and three senior mages whose opinions the Duke considered worth gathering for a practical assessment.
Nobody said anything for a moment.
The cabin was warm. Not the aggressive warmth of a well-stocked fireplace, which pushed heat outward from a single point with the uneven insistence of a strong opinion. This was ambient warmth — present throughout the room at a consistent temperature, occupying the space the way air occupied it, without gradient or direction. It simply was, in all directions simultaneously, and the absence of any visible source for it produced a quality of slight cognitive dissonance in everyone present, the instinctive search for the fire that was not there.
"There is no fireplace burning," said one of the senior mages — Aldermann, a water-aligned specialist whose opinion the Duke valued specifically because he was difficult to impress.
"The heat comes from the radiators," Jonas said from the doorway, where he had stationed himself in the position of someone explaining rather than presenting. "Hot water circulates through them from the steam engine outside. The water cools as it transfers heat to the air, returns to the engine, is reheated, and circulates again. The cycle is continuous as long as the engine is running."
Aldermann looked at the nearest radiator. He placed his hand against it with the professional assessment of someone who was determining temperature by direct measurement rather than approximation. He left it there for several seconds. His expression did not change, but he did not remove his hand quickly, which was itself a form of response.
Griselda had moved to the sink in the anteroom. She looked at the two taps with the focused attention she brought to anything she had not encountered before. She reached out and turned the right-hand tap — the motion careful, the turn deliberate — and water came from the spout with an immediate, steady pressure that did not require pumping or waiting or any action beyond the turn.
She put her hand under it.
"Hot," she said.
"The left tap is cold," Jonas said. "Both draw from the same engine supply but the hot line passes through the heat exchanger before reaching the outlet. Mixing them at the tap allows whatever temperature is preferred."
Griselda turned the left tap. Held her hand under the combined flow. Adjusted the balance once. She stood at the sink for a moment with water running over her hand with the even patience of a mechanism that did not know how to hurry.
She turned both taps off.
She did not say anything. But she turned and looked at her son with an expression that communicated a specific revision of her understanding of what he was dealing with.
In the bathing chamber, Hans had located the toilet and was examining it with the unselfconscious thoroughness of someone who wanted to understand a mechanism and had no particular interest in performing dignity about the process of understanding it. "It flushes," he said, to no one in particular. He operated the flush mechanism once, watched the water move through the bowl and drain, watched the bowl refill from the tank above. "It refills automatically."
"The tank feeds from the cold water line," Jonas said. "The refill is gravity-fed once the engine maintains pressure in the supply line. It requires no action from the user beyond the initial flush."
Elsa had moved to the bathtub. She ran her fingers along the steel rim with the assessment of someone who was simultaneously evaluating the object and the implications of the object — where it would go, what it would replace, how it changed the daily calculation of a dozen things that currently required planning and labor and the carrying of heavy things up staircases. "This would be in the palace," she said. It was phrased as a statement rather than a question but was oriented toward her father.
The Duke had moved through the main room and was standing in the bathing chamber doorway, taking in the full inventory of what Jonas had installed. He had the expression he wore when he was assessing something against multiple simultaneous variables — not the focused attention of a single-threaded evaluation but the broad, quiet consideration of a man running several calculations in parallel without committing any of them to visible output yet.
"The temperature in here," said the third senior mage — a young earth-specialist named Brandt who had said nothing since entering — "has not changed since we arrived. In a stone room in early autumn with no fire, it should have dropped noticeably in the time we have been standing here."
"It maintains consistent temperature as long as the engine is running," Jonas confirmed. "The regulation is mechanical — a valve in the circuit that reduces flow when the ambient temperature reaches the set point and opens again when it drops below. It does not require monitoring or adjustment."
Brandt looked at the valve where it was visible at the base of the nearest radiator. He looked at it for a long time with the expression of a man who understood mechanical systems well enough to follow the logic and was arriving, through following it, at a place that was slightly uncomfortable. Because if the temperature maintained itself, and the water arrived without pumping, and the drainage carried waste away without a second thought, and the whole system ran on a machine that did not get tired and did not need feeding and did not need a mage to operate it — then a significant portion of what currently required either human labor or magical assistance had just been made redundant.
He looked at Jonas with an expression that was professionally neutral and personally unsettled.
Jonas looked back at him with the mild, attentive expression of someone who had expected this response and found it informative.
The Duke stepped back into the main room.
"We will implement this in the palace," he said. It was not a discussion. It was the specific brevity of a decision that had been made during the inspection and was now being communicated as settled. "Full installation. Bathing chambers, kitchen supply, sanitation. I want a proposal for the scope and timeline by the end of the week."
"Yes, your grace."
"And the cost assessment alongside it."
"Already prepared," Jonas said.
The Duke looked at him with the expression that had been appearing on his face with increasing frequency over the past month — the look of a man who has begun to expect that the next sentence will contain something he did not predict, and who is not yet certain whether to find this reassuring or alarming.
The family and the senior mages returned to the main estate by midafternoon. Jonas followed at a sufficient distance to make clear he was not attaching himself to the group, and was met at the estate's side entrance by a servant with a message: the Duke would see him in the study at the fifth hour.
He arrived at the fourth hour and fifty-eight minutes, which was the correct margin.
The study had the afternoon quality of a room that had been working since morning — documents in different positions than they had been at previous visits, the map on the wall with two new annotations in red ink that had not been there last week. The Duke was already in his chair. No Mikayla. No attendants.
Jonas registered the absence. One-on-one meant either discipline or genuine confidence, and given that the Duke had just confirmed the palace installation, discipline was not the current register.
He sat in the chair across the desk at the Duke's gesture and waited.
"The steam engine," the Duke said. "I want production at scale. Not one unit for the estate, not two for a demonstration. Scale." He set his hands flat on the desk. "What does that require."
Jonas had been building to this question for four months. He did not produce the answer immediately — not because he did not have it, but because an answer that arrived too fast communicated that the question had been anticipated, and anticipating the Duke's questions was information he preferred to withhold for now.
He let two seconds pass.
Then he stood and moved to the map.
It was a detailed rendering of Munich and its surrounding territory — the city, the roads, the river, the agricultural land to the north and east, the hunting grounds to the west, the territories of neighboring estates marked in their respective house colors. He found the location he had been considering since the third week of construction and pointed to it without touching the map.
"Here," he said. "Flat ground, twenty miles southeast of the city walls. The access road from the main imperial route passes within four miles of it, which means supply and distribution both have a workable path without new road construction." He stepped back slightly so the Duke could see the full area without obstruction. "The site is not attached to any existing estate or agricultural claim. It is outside the city's jurisdictional boundary, which simplifies the administrative structure. And it is far enough from Munich that the noise and coal smoke are not a civic issue."
The Duke was looking at the map with his hands still flat on the desk.
"A production facility," Jonas said. "Not a workshop. A facility designed from the ground up for volume output — standardized components, sequential assembly, a labor force organized by specialization rather than generalist craft." He paused. "The difference between one engine per month and twelve."
"Security," the Duke said.
"Critical and non-negotiable." Jonas had expected this to be the first objection and had structured the presentation accordingly. "The facility needs to be understood, by everyone who sees it, as belonging entirely to House Meister. Not contracted, not shared, not under mixed authority — House Meister's security and House Meister's mages." He looked at the Duke. "I would recommend a permanent garrison of knights — two rotations, continuous coverage. And specifically: earth mages for the perimeter and structural security, water mages for fire suppression. The facility runs on heat and pressure. A fire mage with hostile intent is the most dangerous single threat to the operation, and water mages present on site make that threat manageable."
The Duke said nothing. He was listening in the specific way he listened when the information was going into a model rather than onto a list.
"Labor," Jonas continued. "Munich has a population of over half a million people. The labor requirement for the facility is significant but the available pool is larger. The work that most people in this era can find is farming, domestic service, guarding, or nothing. Factory work is skilled in a different way — it can be taught to capable people who have not previously had access to work that rewards precision and consistency." He looked at the map again. "Wages above the prevailing rate for comparable labor. Not generosity — incentive. Workers who are paid well enough that this position is worth protecting will protect it. Workers who are paid at minimum will leave or be bought by other interests."
He moved back to his chair and sat.
"Those are the three requirements. Site, security, labor. The material supply chain for component production follows from the mining increase the engine will generate — which is why the mine installations should move in parallel with the facility construction rather than sequentially." He folded his hands. "The facility can be operational within six months of groundbreaking if the authorization moves quickly."
The Duke looked at the map for a long moment. Then he looked at Jonas with the expression that had no clean name — not suspicion, not trust, something that moved between them with the particular quality of two people who are still in the process of determining what they are to each other.
"Six months," he said.
"Conservative estimate," Jonas said. "I would rather deliver it in four and have been wrong in the right direction."
The Duke sat back in his chair. He looked at the ceiling briefly, the way he looked at things that were not in the room — processing them against a larger architecture that Jonas could not see but could, with reasonable confidence, infer.
"I will have a decision for you by the end of the week," the Duke said.
Jonas rose, bowed, and left.
In the corridor outside the study he walked at his usual pace — unhurried, even, the pace of someone whose business in the last room was complete and whose business in the next had not yet begun. He was aware, in the particular way he was always aware of his own internal state as data, that something had shifted in the past two hours.
The cabin had been a demonstration. The conversation just concluded had been something else — the first exchange that had felt less like a boy presenting work to a patron and more like two people planning something together.
He noted this without attaching significance to it that he could not yet justify.
But he noted it.