He found the demolition notice on the city planning board's public database, which he checked every week as a professional habit. It was how he found work, or sometimes how he found that work he had begun was about to become redundant because the building he was documenting had been cleared for full demolition rather than conversion. The notice was for a building in Žižkov, two streets from the storage unit where he had spent two hours sitting on the floor reading Lena's journal three days ago. The building was scheduled for demolition in fourteen days. Category: residential, pre-1900, structural condition rated poor. Preservation assessment: not required.
Not required because no one had assessed it yet.
He cross-referenced the building's address against his node map. It was not one of his confirmed dots. But it was in the gap, the space on the map between two confirmed locations, where the geometry of the network, if it was a network, suggested there should be something. He had noted it as a candidate three weeks ago and had not yet visited.
Fourteen days was enough time. He went the next morning.
The building was on a narrow street that had more of the old Žižkov character than the parts of the district that had been renovated, with older facades, smaller windows, the crowded feeling of a street that had grown without planning around the needs of people who lived close together. The building in question was sandwiched between two others that had been recently painted, which made it look worse than it might have otherwise, with peeling plaster, a boarded ground-floor window, and a front door with a rusted padlock that suggested no one had been inside regularly for some time.
He went around the back. Found a yard, a second door, and this lock was looser than the front one. The screws holding the hasp into the doorframe were almost pulling free of the wood. He lifted the hasp off entirely without needing any tools and set it aside carefully against the wall because he was going to replace it when he left.
The ground floor was what the exterior suggested, empty, damp, stripped of whatever fixtures it had once had, down to bare walls and bare concrete floors over older stone. He went through quickly, torch on, taking baseline photographs because that was a habit. Then he found the stairs down.
Not all older Prague buildings had basement levels. This one did. The stairs were stone, original, older than the building itself, which meant the basement predated the 1800s construction above it by some margin. The stone of the stairs was the right type of Bohemian limestone, pale, dressed by hand, and the hum picked up the moment his foot touched the first step.
Not dramatically. Just present in a way that was immediately more specific than the baseline. He went down.
The basement was one room, low-ceilinged, roughly seven meters by four. Stone walls. Stone floor. A single small window at ground level on the far side, mostly blocked by the building next door, gave just enough ambient light that he could see the general shape of the space without the torch. He swept the torch around. Storage shelving along one wall, old, wooden, half collapsed. A pile of what had been furniture in the far corner, rotted beyond identification. And in the center of the far wall, framed by the ceiling joists above it and the floor below, an archway.
Not a doorway through to another room. The wall behind the arch was solid. This was a decorative or structural arch, a spanning arch built into the wall, the keystone at its apex, perhaps two and a half meters from the floor. The stonework of the arch was visibly different from the surrounding basement walls, older, more carefully dressed, the mortar between the blocks a different composition and color. Someone had built this arch with more care than the rest of the basement warranted.
The hum was stronger here. Measurably stronger. He stood at the entrance to the room and felt it in his sternum and in the bones of his jaw, and he knew before he crossed the floor that this was a node. A real one. One of the high-intensity kind.
He crossed the floor slowly. He photographed the arch from a distance first, then closer, then the keystone specifically. The keystone was larger than structurally necessary, a feature he had noticed at other node locations, the central stone oversized as though it had been designed to carry something other than the weight of the arch above it. He could see, in the torchlight, the faint marks of carving on its surface.
He reached up and touched the keystone.
The world went sideways.
Not physically. He didn't fall. He didn't move. But everything that was him, his sense of being a body in a specific location, his awareness of the room around him, his continuous thread of thought, all of it contracted violently, and then something else rushed in to fill the space.
Hands. Someone else's hands, not his, pressing something into wet mortar between two blocks of stone. Working fast, in very little light, a single candle or torch somewhere to the left, throwing steep shadows. The mortar was cold, and the hands were cold, and the work was urgent, not panicked, but urgent, the urgency of someone who understands they have a limited amount of time and is using every second of it. The hands pressed the object into the mortar joint, smoothed the surface, and pressed again. The object was small, disc-shaped, and carved on one face. He couldn't see it clearly. The hands kept working.
Around the hands, in his peripheral awareness, he could sense more than see other people in the space, more than one, all working with the same urgency, and beyond them something vast and pressurized that was neither sound nor light but was absolutely real, a presence that was the reason for the urgency, the thing they were working against or working to contain. The mortar was going cold. The hands kept pressing.
Then nothing.
He was standing with his hand on the keystone of the arch in the basement of a condemned building in Žižkov, and the torch was in his other hand, and the battery indicator on the torch was low and had not been low when he came down the stairs.
He looked at his watch.
He had been in the basement for four hours and seventeen minutes.
He had no memory of any of it beyond the first thirty seconds after touching the keystone.
His legs were fine. He wasn't dizzy. He wasn't confused about where he was or who he was. He was simply missing four hours of continuous experience, the way a hard drive was missing a file, not corrupted, just absent, the space where it should have been simply empty.
He lowered his hand from the keystone. The hum dropped back to its usual register immediately, as though the contact had been an open valve that, closing his hand shut off. He stood for a moment, and then he looked at his phone.
The battery was at eight percent. It had been at seventy-three percent when he came in.
He opened the camera roll.
Two hundred and fourteen photographs. Taken between eleven-seventeen in the morning and three twenty-two in the afternoon. He scrolled through them. All of the basement. All of the arch. The keystone from every possible angle. The walls of the basement, the floor, the ceiling. The archway from distances he did not remember covering, angles he did not remember choosing. Some of them were technically very good, better than his conscious photography often was, more patient, held longer, the torch positioned with precision to bring out surface detail in the stone.
He had taken two hundred and fourteen photographs in four hours, and he remembered none of them.
He looked at the keystone one more time. In the torchlight, he could see the carving on its face clearly now from this distance. The same geometric script. A single line of it, tightly packed, running across the width of the stone.
He photographed it again, consciously, deliberately, so he had a record made by his actual self rather than whatever had been operating his body for the last four hours.
Then he went back up the stairs and across the ground floor and out through the back door and replaced the hasp carefully on the doorframe and walked back to his apartment in the pale afternoon light, thinking about hands pressing something into cold mortar in the dark, and the sense of something vast and pressurized that had existed in the room around them.
He sat at his kitchen table and looked at the two hundred and fourteen photographs for a long time.
Some marks, the second inscription had said, once found, cannot be unfound.
He was starting to understand what that meant.
End of Chapter 11