The word on her wrist was written in red ink.

  STAY.

  Not smeared, not faded at the edges the way ink looked when you wrote on skin from the outside. The letters sat cleanly, as if applied with a fine-tipped pen, the downstroke of the Y curving slightly in the way her own handwriting curved. She held her wrist under the kitchen light and turned it, looking for the tremor of an unsteady hand, the evidence of someone else's grip. The letters were too neat. The hand that wrote them had been unhurried.

  She didn't remember writing it. She didn't remember falling asleep. The last sequential memory she had was standing at the table with her hand on the warm reel, feeling its pulse against her fingertips, and then morning was simply present—light through the blinds, a body in the bed, and the word on her wrist telling her something she hadn't decided yet.

  The reel sat on the desk across the room, perfectly rewound. Final Composition – C.M. The label was in the same handwriting as the first tag she'd ever found in this apartment, back when she'd still believed she was conducting research rather than being conducted.

  She tried her phone first. Dead—not the slow death of a depleted battery but the total absence of a device that had forgotten it was on. Her laptop was the same, its screen a flat and lightless rectangle. The building's power was working; the refrigerator ran and the overhead lights came on when she hit the switch. Whatever had taken her devices was selective. It knew what she might use them for.

  She stood at the kitchen counter and let herself feel the melody running under everything—under the sound of her own breathing, under the small structural ticks of the building, underneath thought. It had been a sound once, then a feeling, and now it was closer to weather: ambient, pervasive, something she moved through rather than heard. She could not remember the last moment it had been absent.

  She packed quickly. Journal, clothes, recorder, Grayson's frequency scanner. She moved with the focused economy of someone who understood that deliberation was a liability. She took the reel from the desk and put it in her coat pocket before she'd fully decided why—some instinct that said keep it close in the same register as the instinct that said get out, the two directives not quite reconcilable.

  She was reaching for the key on the counter when she stopped.

  The apartment was empty. She had checked it—the bathroom, the closet, behind the door. And yet the air had a quality she had learned to read over these weeks, a particular density, the feeling of being inside a room that is also, in some way, inside something that is watching.

  She stood still for a moment.

  Then she picked up the key and left.

  The hallway was wrong in a way she registered before she could name it.

  Visually it was exactly as it had always been—the wallpaper with its faded pattern, the dim overhead bulbs, the long corridor of numbered doors. But the soundscape was gone. Not the ordinary quiet of a sleeping building at an early hour. Something more total than that. No water moving through pipes. No television murmuring behind a neighbor's wall. No baseline hum from the elevator shaft. The silence was the silence of something that had been turned off.

  She let her door close behind her and immediately tried the deadbolt.

  The bolt moved but didn't catch. She tried again—jiggle, pressure, release. Nothing. The mechanism moved freely in its housing as if the strike plate had been removed, as if the door had decided there was no longer a meaningful distinction between locked and unlocked. She stood in the hallway and looked at it for a moment, then stopped wasting time on it and turned toward the elevator.

  She passed 6C.

  The door was open an inch.

  She had not seen that door open once in eight months. The building manager had described the unit as vacant during a conversation she could no longer fully reconstruct, sometime in the fall, and she had believed it with the incuriosity you applied to the parts of a building you didn't need to think about. The door stood open an inch now, the darkness of the gap absolute, no light inside from any window.

  She should have kept walking.

  She pushed the door open and looked.

  The apartment was her apartment, dimensionally—the same layout, the same window placement, the same corner where her bookshelf stood. But stripped. No furniture, no fixtures, nothing to suggest habitation at any point in recent history. Dust on the floor in an undisturbed layer. The particular cold of a room that had been sealed too long.

  In the center of the living room floor, a tape recorder.

  She knew the model. She owned the model. She crossed the room and crouched over it, and turned the label toward the light coming in from the hallway.

  Echo Chamber 2 – Claire Mitchell.

  Not a subject number. Her name. Her full name, first and last, the same hand as all the others.

  She stood up and left the apartment at a pace that was not quite running because she would not run, she was deciding not to run, she was maintaining a minimum of control over her own locomotion even now.

  The narrative has been stolen; if detected on Amazon, report the infringement.

  The elevator didn't respond.

  She took the stairs.

  Fifth floor, fourth, third—her footsteps coming back to her in clean echo, the stairwell perfectly ordinary. She reached the second floor landing and her vision went strange at the edges, a whitening, a sense of the spatial relationship between things becoming briefly unreliable, and then she was on the sixth floor.

  Standing in the hallway. 6A, 6B, 6C. Her door wide open.

  She looked at it for a moment.

  Then she turned and went back to the stairs.

  She went faster this time, keeping one hand on the railing, counting the flights as she descended. Second floor. The whitening came again—less like dizziness and more like a splice, like a cut in film where two pieces of footage have been joined without matching frames—and then the sixth floor hallway again. Her door. The three numbers and the letter she'd looked at every day for eight months.

  She sat down on the landing and put her hands on her knees and breathed.

  The building was not going to let her use the stairs. She did not know how that was possible. She noted its impossibility and set it aside and concentrated on what was actually in front of her, which was a landing and a closed door to the fifth floor and the knowledge that she had tried this twice and arrived in the same place twice.

  Her phone vibrated in her bag.

  She took it out. The screen was on—battery at 63%, which meant the death this morning had been selective. One notification: a voicemail. She had not heard it ring and there was no missed call logged.

  She played it.

  Her own voice, slightly flattened by the compression of a recorded message, speaking with a calm she did not currently possess.

  If you're hearing this, you didn't make it out. But you can still finish the work. Go back to the room. Trust the composition. It knows the shape of you.

  She listened to it again to make sure she'd heard it correctly.

  She had.

  She put the phone in her bag and sat with the silence of the stairwell for a moment longer. Then she stood up, went back through the door, and walked down the hallway to her apartment.

  The tape recorder had turned itself on.

  She could hear it from the doorway—the reel spinning, the playback head reading what was there, the melody coming through the small speaker with a clarity and fullness that it shouldn't have been capable of. She walked inside and stood over the recorder and listened.

  She had spent enough time with Evelyn's composition to know its structure the way you knew a room you'd lived in—not just the shape of it but the feel, the way the light moved through it, the places it opened and the places it closed. This was not that. This was built from Evelyn's melody the way a house was built from earlier materials: the bones recognizable, the structure transformed. She heard the fragment she'd been looping for days, and she heard underneath it a lullaby she hadn't thought of in twenty years—her mother's voice, the specific timbre of it, not a recording she'd ever made but an interior sound that had no business being here. She heard static that she knew was the static from her first podcast recording, the one she'd made in her car on her phone at twenty-six, before she had any equipment. She heard street noise from Chicago, August, a summer she could place by the humidity in it.

  The composition knew her the way only she knew her.

  Then a second voice came in beneath it.

  Male. Calm. Grayson's.

  "Subject integration at eighty-seven percent. Echo stabilization confirmed."

  She was still for a moment.

  "Phase Three initiates upon full submission. Resistance is anticipated and factored."

  She lunged across the room and pulled the reel from the deck.

  She threw it—a clean, hard throw, the thing she did in college when she was angry, that full-arm swing—and it hit the wall and clattered down and came to rest near the baseboard.

  The melody continued.

  She stood in the center of the room and understood, with a completeness that precluded argument, that the sound was no longer coming from the device. The device had been a delivery system, and the delivery was complete, and what remained was what had been seeded. She pressed her hands over her ears and it made no difference whatsoever—the melody ran on, steady and unhurried, from somewhere behind sternum.

  She went to the bathroom. She locked the door. She sat on the edge of the tub with her hands still pressed to her ears, which was useless, and stayed there until she couldn't track time anymore.

  She was on the living room floor.

  The light had shifted—later, the shadows longer. She didn't know how long she'd been there. She lay for a moment looking at the ceiling, which was ordinary, which was simply a ceiling, and felt the walls doing something she could sense only at the edge of perception: a low, continuous vibration, so slight it registered more as a change in the quality of the air than as sound. The building breathing. The building settled into some new operational phase that required no more concealment.

  She crawled to the recorder.

  The reel was back in place. Rewound and waiting. She checked the label as if it might have changed. It had not.

  She pressed play.

  A voice she didn't recognize—not clinical this time but functional, the voice of someone logging a completed task.

  "Echo Chamber 6B. Transfer complete. Host identity embedded. New cycle begins."

  She reached for her phone. New voicemail. Same absence of a missed call.

  She played it.

  Two words.

  Welcome home, Evelyn.

  She sat on the floor for a long time after that. Long enough for the light in the room to change again, the shadow of the window frame moving slowly across the floorboards the way shadows did, indifferent and precise.

  She didn't scream. She was surprised to find she didn't want to.

  What she felt was closer to the particular exhaustion that came after a long confusion finally resolved—not relief exactly, nothing as clean as relief, but the strange stillness of a mind that had been running hard against a locked door and had just realized the door opened the other way.

  She understood it now, the whole architecture of it. Project Mnemosyne had never been about haunting. Haunting was passive, was residue, was the dead refusing to leave. This was the opposite. This was a system built to take someone living and layered and irreducibly herself—her specific grief, her particular way of hearing, her exact shape of loss—and use it as raw material. The subjects before her had failed or died or disappeared into silence. Evelyn had come the closest. Evelyn had written her own signal in the margins of theirs, had almost rewritten the base code, but they had escalated and she had not survived it.

  Claire had survived it.

  And what they had built from her—from the eight months of her, from every dream and false memory and moment of dissociation—was sitting in the tape deck, warm and complete, waiting for whatever came next.

  She wasn't being haunted.

  She was being replaced.

  And somewhere in the part of her that remained, the part that could still observe the situation from a slight distance, something that felt like interest stirred alongside the dread. Because she was still here. Still observing. The transfer was allegedly complete, and she was still thinking in her own voice, still running her own inventory, still the person who had moved into unit 6B eight months ago with a recorder and a list of names.

  Host identity embedded.

  But she was still the host.

  She looked at the recorder. She looked at the reel.

  She thought about what Evelyn had done, when she understood what was being done to her.

  She had composed.

  Claire picked up her journal and opened it to a blank page. Her pen moved to the top of the page and paused.

  Then she began to write.