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"Step away from the door."
Mara didn't move. Her hand was already on the brass handle, fingers tight around the metal. It felt warm. Too warm.
"I mean it." Adrian's voice came from behind her, low and sharp. "You open that, the whole block goes."
"You don't know that."
"I know enough." His footsteps scraped closer on the cracked pavement. "The seals are breaking. That door's not locked from the outside. It's locked from the inside. Whatever's in there wants you to open it."
She turned her head just enough to see him in her peripheral. He looked worse than he had an hour ago. Sweat on his forehead, jaw tight, hands shaking. The Black Key hung around his neck on a thin chain, and it was glowing faintly in the dim light.
"My mother's name is on this lock," Mara said. "I'm not walking away."
"Your mother's dead."
"Then she left something behind."
Adrian exhaled hard through his nose. "Yeah. A trap."
Mara pulled the blade from her belt in one smooth motion and turned. She closed the distance between them fast, pressing the edge against his throat before he could step back. His spine hit the brick wall behind him.
"You've been lying since the second I walked into your shop," she said. "You know what this door is. You know what the Black Key does. So start talking, or I open it anyway and we both find out."
His throat moved under the blade as he swallowed. His eyes didn't leave hers.
"You really want to do this here?" he said quietly.
"I want answers."
"You want revenge." His voice was steady, but she could feel his pulse hammering against the steel. "You think your mother got screwed by the city. You think someone locked her up and threw away the key. You're not wrong. But opening that door won't give you justice. It'll just give you a body count."
"How do you know?"
"Because I've seen it before."
The Black Key flared brighter. Mara felt heat roll off it in a wave, sharp and metallic, like standing too close to a forge. Her skin prickled.
"Let me guess," she said. "You opened one. Things went bad. Now you're the guy who tells everyone else not to."
"Close enough."
"Not good enough."
She pressed the blade harder. A thin line of red appeared at his collar.
"Mara." His voice dropped. "If you open that door, you're not going to like what comes out. And I'm not talking about curses or dead zones. I'm talking about the thing your mother locked herself in with."
Her hand faltered. Just for a second.
"What?"
"She didn't get locked in," Adrian said. "She went in. Voluntarily. And she sealed it from the inside so no one else could follow."
Mara's breath caught. "You're lying."
"I wish I was."
The blade trembled in her grip. She wanted to cut him. She wanted to scream. She wanted to tear the door off its hinges and prove him wrong.
But the Black Key was burning now, hot enough that she could feel it from where she stood. And the door behind her was humming.
"She left me a message," Mara said. Her voice came out rough. "In the files I burned. She said, 'Bring the Black Key home.' So either you're wrong, or she wanted me to finish what she started."
Adrian's eyes widened. "You burned the files?"
"Fake ones. The real record's in your coat pocket."
He blinked. Then he looked down. His coat was still hanging over his arm, and when he shifted it, a slim folder slid halfway out.
"When did you—"
"When you were distracted by the street splitting open."
He stared at her. Then, despite everything, he laughed. It was short and bitter, but it was a laugh.
"You're insane," he said.
"And you're bleeding."
She pulled the blade back. He touched his throat, fingers coming away red.
"You've got a hell of a way of asking for help," he muttered.
"I'm not asking."
"Yeah. I noticed."
The hum from the door grew louder. Mara turned back toward it, and the warmth in the handle flared into heat. She yanked her hand away, hissing.
"It's responding to you," Adrian said. He stepped up beside her, close enough that she could feel the tension radiating off him. "The Black Key's tied to your family. That's why it heated up when you touched the lock. It recognizes you."
"So what does that mean?"
"It means you're not just the inspector. You're the anchor."
Mara's stomach twisted. "Anchor for what?"
"For whatever's behind that door."
The street trembled. Cracks spiderwebbed out from the base of the door, thin lines of shadow that smelled like rust and burnt sugar. The Black Key swung forward on Adrian's chest, pulling toward the lock like it was magnetized.
He grabbed it with both hands, holding it back. His knuckles went white.
"We need to go," he said through gritted teeth. "Now."
"Not until I know what she locked in there."
"You want to know?" He turned on her, eyes wild. "Fine. Your mother found the breach. The real one. Not the little fissures the city's been patching for twenty years. The source. And she went inside to close it, because no one else would. But it didn't close. It just moved. And now it's spreading again, and the only reason the whole city hasn't collapsed into the void is because she's still in there holding it shut."
Mara's chest went cold. "That's not possible."
"Why not?"
"Because she's been dead for fifteen years."
"Has she?"
The door clicked. Once. Twice.
Adrian's face went pale. "We're leaving. Right now."
He grabbed her wrist and pulled, but Mara dug her heels in. The handle turned on its own, slow and deliberate, and the door creaked open an inch.
Cold air poured out. It smelled like wet stone and old blood.
And then, from the other side, a voice.
"Mara."
It was soft. Familiar. The kind of voice that used to read her bedtime stories and braid her hair before school.
Mara's throat closed.
"No," Adrian said. "Don't listen. It's not her."
But the voice came again, clearer this time.
"You didn't come for the key," it said. "You are the key."
The Black Key tore free from Adrian's grip and shot forward, slamming into the lock with a sound like a gunshot. The door flew open.
And Mara saw her mother's face in the dark.