The thing in the corridor was fast.

  Marcus saw it move twice before he understood what he

  was looking at. Low to the ground. Four legs maybe.

  Hard to tell because it didn't stay still long enough.

  Back and forth in front of the stairwell door like

  it was waiting for something to come through.

  Known Routes had already rerouted him. Left corridor.

  Maintenance access. Up through the service side.

  He went left.

  ---

  The maintenance corridor was narrow and dark and smelled

  like cleaning fluid and old pipes. His wet shoes squeaked

  on the linoleum. He slowed down. Moved heel to toe the

  way he did in apartment buildings with thin walls and

  noise complaints.

  Eleven years of courier work. You learn fast which

  sounds get doors opened at you.

  Known Routes showed him the path. Service stairwell

  at the end of the corridor. Second floor. Third. Fourth.

  He moved.

  The stairwell door was marked STAFF ONLY. He pushed through.

  Dark inside. Emergency lighting only. Red tint to

  everything. He took the stairs two at a time, one hand

  on the rail, courier bag tight against his back.

  Second floor landing. Something on the other side of

  the door. Heavy. Slow. Moving away.

  He waited.

  Known Routes showed him the timing. Fifteen seconds.

  He counted. Went through.

  ---

  Third floor was worse.

  Not monsters. People. Twelve of them barricaded at

  the far end behind overturned gurneys and a nurses

  station pushed sideways across the hall. Done fast

  and scared and not very well.

  A man in scrubs saw Marcus and held up both hands.

  "Don't move. Don't make noise. There's something

  in the east wing."

  Marcus looked at the barricade. Gap between the

  nurses station and the wall. Thirty centimeters.

  Known Routes flagged it. Passable.

  "I need the fourth floor," Marcus said quietly.

  "Stairs are blocked above us. East stairwell is

  gone. West stairwell we don't know. We've been

  here two hours."

  This book is hosted on another platform. Read the official version and support the author's work.

  Marcus looked at him. Looked at the barricade.

  The west stairwell was fine. Known Routes didn't

  show him clear paths through things that weren't clear.

  "West stairwell is open," Marcus said.

  "How do you know that?"

  "Pathfinder class."

  The man stared at him.

  "We've been sitting here for two hours," a woman

  said from behind the station. Tired and angry

  in equal measure.

  "I know," Marcus said. "I'm going up.

  You can follow if you want."

  He went through the gap.

  ---

  Here's the thing about hospitals most people don't know.

  The parts you see — corridors, wards, waiting rooms —

  are maybe sixty percent of the building. The rest is

  service infrastructure. Freight routes. Linen corridors.

  Pipe access. The paths that keep the building running

  that nobody in the public areas ever uses.

  Marcus had delivered to hospitals before. Not often.

  But enough.

  Enough to know every hospital had a freight elevator

  on a separate power circuit. Enough to know the linen

  chute ran from the basement to the top floor with

  access hatches on every level. Enough to know the

  service corridors ran parallel to the main ones and

  connected at points that weren't on any visitor map.

  Known Routes showed him all of it.

  The west stairwell was around the corner. He got

  there in forty seconds. Pushed through.

  Clear.

  He looked back. All twelve following. The man in

  scrubs at the front.

  "Stay close," Marcus said. "Heel to toe on the stairs."

  "Heel to toe?" the woman said.

  "Quieter. Trust me."

  He went up.

  ---

  Third floor to fourth.

  Known Routes flagged something at the landing before

  he reached it. Not blocking the path. Off to the right.

  Stationary.

  He stopped at the door. Held up a hand. Group stopped.

  He listened.

  Breathing. Something breathing on the other side.

  Slow and heavy. Not human.

  Known Routes: through the door, left immediately,

  service corridor parallel to the main hall, thirty

  meters, cut-through into the main corridor past

  whatever was on the landing.

  He turned to the group. One finger. Pointed left.

  Mouthed: stay left.

  The man in scrubs nodded.

  Marcus pushed the door open slow.

  The thing on the landing didn't move. Big. Facing away.

  Marcus went through and immediately left, back flat

  against the wall, moving sideways.

  The group came through behind him. One at a time.

  Quiet. Nobody ran.

  The service corridor smelled like bleach, overhead

  lighting half out. Marcus moved with one hand on

  the wall, Known Routes showing him every meter.

  Cut-through marked HOUSEKEEPING. He pushed through.

  Main corridor. Fourth floor.

  All twelve through. He counted them.

  The man in scrubs let out a long breath.

  "How did you know it wouldn't follow?"

  "I didn't," Marcus said. "Known Routes showed

  me a path through. If it was clear it was clear."

  "That's not reassuring."

  "No," Marcus agreed.

  ---

  Room numbers on the doors. He was at 401.

  Even numbers right.

  Room 412 was at the end.

  He started walking.

  The corridor was long, overhead lights flickering

  at the far end. Doors on both sides. Most closed.

  One open, window broken, curtain moving.

  He passed 404. 406. 408.

  He could hear her.

  Not words. Just her voice through the door of 412,

  talking to someone inside. The specific cadence of

  Lily when she was keeping people calm. He'd heard

  it his whole life, mostly directed at him.

  He stopped at 410.

  Two doors away.

  Known Routes updated.

  He looked at the floor.

  Buckled. Two meters of linoleum pushed up in the

  center, edges cracked, a dark gap where the floor

  had separated from the wall.

  Known Routes showed him the weight distribution.

  Held one person if they moved fast and stayed

  left where the subflooring was still connected.

  He looked back at the group.

  "I go first. One at a time after. Left edge.

  Don't stop in the middle."

  He went. Left edge. Fast. The floor flexed under

  him, gave just enough to feel wrong.

  Three seconds and he was through.

  One at a time after. The floor held for each of them.

  Last one through.

  He turned to 412.

  He'd been moving for two hours. Fourteen kilometers.

  Monsters. A cliff face. A hotel full of rubble.

  A hospital with something fast in the lobby and

  something big and breathing on the landing behind them.

  He knocked.

  Silence. Then Lily's voice close to the door.

  "Who is it?"

  "It's me."

  The sound of something heavy being moved.

  Click of the lock.

  The door opened.

  Lily stood there in a hospital gown and grip socks.

  She looked at him. Soaking wet. Sand in his hair.

  Courier bag on his back.

  A long moment.

  "You're late," she said.

  "I know," he said.

  He handed her the courier bag. She took it without

  thinking, looked down at it, looked up at him.

  "Dad. Why is your work bag here."

  "Packages. I'll explain later."

  He stepped inside.

  ---

  Two nurses. An older man in a hospital gown.

  A teenager who'd been crying long enough to stop.

  "Is this everyone on the floor?" Marcus said.

  "No," one of the nurses said. "More in other rooms.

  We've been trying to stay quiet."

  "How many?"

  "Twenty maybe. More."

  Marcus opened Known Routes.

  Thought about the whole building. Every floor.

  The ability fired.

  PATHFINDER ADVANCEMENT — THRESHOLD REACHED.

  KNOWN ROUTES now includes: personnel tracking

  within one kilometer.

  Dots appeared in his mind like a delivery map.

  Each one a person. Each one a location.

  Each one a path leading straight to them.

  Forty-one.

  Forty-one people scattered across five floors.

  Forty-one dots, each one waiting, each one not

  knowing there was a way out. He could see every

  path to every one of them and the weight of it

  hit him all at once — too much, same as a full

  route sheet on a bad morning. No option but

  to start at the top and work down.

  He tightened his grip on the courier bag.

  He looked at Lily.

  She was watching his face the way she always did

  when he was mapping something. She'd done it

  her whole life.

  "How many?" she said.

  "Forty-one. Five floors."

  She looked at the nurses. The man in the gown.

  The teenager. Back at Marcus.

  "Okay," she said. Already decided. Like the

  conversation had happened and they were

  just catching up to it. "So what do we do?"

  Marcus looked at the bag. Four packages.

  Forty-one people. Every path mapped and waiting.

  He'd mapped it all. Every person. Every route.

  The whole building lit up in his head like a

  city he'd been delivering in for years.

  And he still wasn't done.

  "We move," he said.

  Then the building shook.

  Not an explosion. Not a collapse. Something

  deliberate. Something heavy, hitting the same

  spot twice, three times, from below. The floor

  vibrated under their feet, a ceiling tile dropped,

  and somewhere below them something let out a sound

  that wasn't quite a roar —

  more like a signal.

  Like it was telling something else exactly

  where they were.

  Marcus opened Known Routes.

  Forty-one paths. Still there.

  Three of them had gone red.

  Ground floor. Something deliberate. Something

  that had found a door and understood what doors were.

  He tightened his grip on the bag.

  "Change of plan," he said. "We move now."