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"Come on."
Avery Vale had thirty seconds before the guards found her, and the lock just grew a second keyhole.
Her fingers were already bleeding. Thin red lines where the teeth had bitten into her skin. The blood ran along the brass and vanished into the metal like the door was drinking it.
"That's new," she muttered.
So was the second keyhole.
She crouched in the service passage behind Blackmere Estate's west gallery, one knee in the dust. The vault door filled the dead end. Someone had hidden it behind a painting of a duke with a weak chin.
She'd found the door by accident.
The key had found it on purpose.
Her phone buzzed.
WHERE ARE YOU?
Avery locked the screen.
Footsteps pounded on the other side of the wall.
"Check the gallery again!" A man's voice, too close. "She took the case key. She can't have gotten far."
Of course she couldn't. Three exits. Six cameras. Forty-two guests drinking champagne under a chandelier worth more than her building. They'd sealed the front drive the second the emerald went missing.
The emerald she hadn't stolen.
The emerald that had somehow ended up in her tool case while three hundred people watched.
Avery leaned closer to the lock.
It sat in the middle of the iron door, right where a keyhole should be. Except it looked wet. Not polished. Wet. Tiny ripples moved across the brass, pushing the dust away.
No maker's stamp. No screws. No hinges on the door, either.
She'd spent eleven years opening locks for people who paid too much to hear no. Antique safes. Museum cases. Custom vaults. A stupid number of designer handbags. She knew locks.
This one had no business existing.
The first keyhole changed shape while she watched.
Avery pulled her hand back.
The hole narrowed. Then widened again.
"That's disgusting."
The footsteps got louder.
She took the black iron key from her pocket.
It was the reason everything had gone wrong tonight. She'd found it inside the dead duke's display cabinet, tucked behind a panel the auction catalog never mentioned. Long and thin, with teeth like tiny claws. No bow. No handle. Just cold black metal that stayed cold no matter how long she held it.
When she'd touched it, every light in the gallery had died.
When she'd pulled it free, the vault door had appeared.
And when the emerald vanished, the key had been sitting in her case.
She'd tried to throw it away twice.
Both times, it came back.
The lock clicked.
Avery froze.
Something moved behind the door. Not a person. The iron bowed outward in one slow pulse, like a chest taking a breath.
The black key trembled in her hand.
"Nope," she whispered. "Absolutely not."
A guard slammed his hand against the wall outside.
"Vale! We know you're back here!"
Her name sounded wrong in his mouth. Like a verdict.
She looked at the lock.
Two choices. Let the guards catch her with a stolen emerald in her case, or open a door that just breathed.
First choice: prison.
Second choice: probably murder.
She'd never been good at picking the safe option.
Avery pushed the key into the first hole.
The metal snapped shut around it.
Her hand jerked.
The lock was warm now. Warm and soft under her palm, with a faint pulse that matched her wrist.
The second keyhole opened beside it.
She hadn't seen it form. One second, smooth brass. The next, a dark oval with ridged edges.
A thin line appeared beneath it. Then another.
Grooves spread across the door in branching lines, like veins under skin.
"You're kidding me."
"Vale! Step away from the door!"
The guard's voice was closer. Maybe ten feet. The passage had two turns, but that wouldn't slow him down.
Avery pulled a pick from her sleeve.
It bent the second she touched the second hole.
She swore and grabbed another.
The lock tightened around the first key. Not stuck. Holding.
Avery planted one hand on the door and worked the pick into the second hole. The interior was wrong. No pins. No springs. No familiar resistance. The pick slid through something slick, then hit a hard ridge.
She adjusted her wrist.
The ridge moved.
The lock made a sound like a wet cough.
Avery almost dropped the pick.
"Okay. I heard that. Locks don't make noises."
The door pulsed under her hand.
The black key turned by itself.
Pain shot through her fingers.
She yanked back. The lock held on.
The brass had climbed over her knuckles.
It wasn't gripping her hand. It was copying it.
Tiny raised lines spread across the metal, tracing every crease in her palm. Her fingerprints appeared one by one, bright red under the brass. The pattern traveled from her thumb to her fingertips, perfect and exact.
Avery's breath caught.
The lock pressed harder.
Her skin tingled. Then burned.
"Let go."
It didn't.
The second keyhole widened. A strip of blue light leaked from inside the door.
The guard rounded the corner.
Avery saw his reflection in the iron. Broad shoulders. Black uniform. One hand on his pistol.
"Hands where I can see them!"
She looked at the vault.
The lock had her fingerprints now. Not just the prints. The whorls. The scars. The tiny white mark at the base of her index finger from when she was twelve and thought a broken window was a shortcut.
The door knew her.
That thought landed hard.
The guard raised his weapon. "Step away, Avery. Now."
"You first."
"Don't make this worse."
"You found me hiding beside a door that wasn't on the estate plans. I think worse already showed up."
"You stole the Blackmere emerald."
"I was framed."
"Tell it to the police."
"I will. Right after I get out of here."
The guard took one step forward.
The lock copied the last fingerprint.
Avery felt the exact moment it finished. The burning stopped. The brass went cold. The door gave a deep, heavy click.
The guard saw it too.
His face changed. Not fear. Recognition.
That was worse.
"What is that?" Avery asked.
He backed up.
"Take your hand off it."
"You know this door?"
"Take your hand off it!"
"What did you people buy tonight?"
The guard's gaze snapped to the black key. "Where did you get that?"
Avery smiled without humor. "You tell me."
He lifted the pistol.
Avery twisted the key.
The lock screamed.
Not a metallic squeal. A real scream. High and sharp, bursting through the passage and shaking dust from the ceiling. The guard staggered and clapped a hand over his ear.
Avery's teeth hurt.
The blue light inside the second keyhole flared.
The iron door shuddered.
The lock dragged her hand forward, forcing her palm flat against the metal. Avery gritted her teeth and tried to pull away. Her shoulder burned. Her boots scraped the floor.
"Get off me!"
The door answered with a low growl.
The guard fired.
The shot cracked through the passage.
Avery ducked.
The bullet struck the door beside her head and vanished into the iron without leaving a mark.
The guard stared at the empty impact point.
Avery didn't waste the opening.
She drove the pick into the second keyhole and felt around blindly. Her hand shook. The metal inside shifted under the tool, sliding away from the pick like something alive trying not to be touched.
She remembered the shape of the lock. Not what it looked like. What it wanted.
Every lock had a want. A bolt wanted to move. A tumbler wanted pressure. A cheap cylinder wanted you to stop rushing and line up the pins.
This one wanted her.
Fine. She could work with that.
Avery pressed her thumb harder against the copied print.
The lock tightened around her skin.
"You want me?" she hissed. "Then open."
The second keyhole snapped shut around the pick.
The tool broke.
Avery stared at the empty shaft in her hand.
The guard lowered his pistol a little. "Move away from the door. Slowly."
Behind him, more footsteps pounded through the gallery. They were running now.
Avery's heart slammed against her ribs.
She had one tool left. A narrow tension wrench, bent at the tip. It wasn't meant for anything this complicated. It was barely meant for a stubborn apartment lock.
She shoved it into the second hole.
The lock opened its mouth wider.
Avery stopped breathing.
The ridges around the keyhole had become teeth. Small ones. Sharp ones. They clicked against the wrench.
"No," she said.
The door pulsed again.
Blue light spilled over her hands and painted the guard's face sickly white.
"Avery," he said, and his voice had lost its edge. "Listen to me. Get away from it."
"You said the same thing before you shot at me."
"That door isn't an exit."
The words hit harder than the bullet.
Avery looked at him. "Then what is it?"
The guard's mouth opened. Nothing came out.
The footsteps reached the passage entrance.
Someone shouted, "Is she in there?"
The guard didn't answer.
Avery stared at the lock's copy of her hand. The lines were still glowing under the brass. Her fingerprints had sunk into the door like the metal had memorized her.
She could let go. Maybe the lock would release her. Maybe the guards would only arrest her. Maybe the emerald would be found in her case, exactly where someone had planted it, and the people who set her up would walk away clean.
No. She was done with maybe.
Avery wrapped both hands around the key.
The lock jerked.
The guard shouted, "Don't turn it!"
She turned it anyway.
The key resisted like it'd been welded in place. Avery leaned into it. Her boots slipped in the dust. The old plaster scraped her back. Every muscle in her arms shook.
The lock pulled harder.
Pain ripped through her palm.
Her fingerprints flared blue.
The guard lunged toward her.
The door moved first.
Not open. It split.
A glowing blue mouth grew across the iron, stretching from one edge of the vault door to the other. The copied fingerprints peeled apart as lips. Rows of pale, glassy teeth pushed through the metal.
The guard screamed.
Avery had just enough time to say, "Oh, hell no."
The mouth inhaled.
The passage disappeared into a blast of cold air. Her tools flew from her belt. Her phone tore from her pocket. The guard slammed into the wall and grabbed for a pipe, but his fingers missed.
Avery dug her heels into the floor.
The mouth pulled harder.
Her shoulder wrenched. Her hand stayed trapped in the lock. Blue light burned across her skin, racing up her arm in thin lines.
"Let go!" the guard shouted.
"I'm trying!"
The mouth opened wider.
For one second, Avery saw what waited past the teeth.
A street. Crooked towers. Black windows. Thousands of blue lights burning in the dark.
And something tall standing at the end of it, watching her fall.
Then the door swallowed Avery Vale whole.