It smelled exactly how it looked.

The Nocera City sewers were the darkest place in the city, and apparently not the emptiest.

Mr Rabbit walked a step behind, letting the four Creeps lead. He'd learned in the first ten minutes that they moved differently down here. Looser. More certain. Like the dark was something they'd made their peace with long ago.

A door.

The first level looked like what it was, an old maintenance grid. Transit infrastructure from an era the city had stopped counting. Rusted rails, collapsed signage, the bones of a station that had once moved thousands of people and now moved no one.

Lina had been here before. A dozen times, hiding from drones. She moved without looking.

Another door.

The second level was newer. Dark, but not empty, cables ran along the walls in thick bundles, hundreds of them, all going the same direction. Down. Mr Rabbit followed them with his eyes and couldn't find the end.

Tools everywhere. Mechanical parts. Broken neon signs in stacks. The air smelled like chemicals and hot metal, like something was being built constantly and never finished.

He felt it before he saw it, the specific sensation of being watched. Not hostile. Observational. Something or someone cataloguing the new arrivals.

He didn't show it.

Lina glanced at him once. Just once.

I know. It's fine. Keep moving.

He kept moving.

Another door.

"How far down?" Mr Rabbit asked.

The green one turned his head. Something crossed his face, not quite a smile, but close. The expression of someone who has been asked a question they've been waiting for.

"Far enough," he said.

He pulled the handle. The door opened.

And there it was.

Mr Rabbit stopped.

Even Lina stopped.

It wasn't what he'd expected. He didn't know what he'd expected, more tunnels, maybe. Another level of dark and cable and rust.

Not this.

It was a city.

Built into the cave like it had grown there, buildings rising up along the rock walls, two and three stories tall, rough but standing, windows lit from within. A river ran through the center of it, black and quiet, crossed by a wide bridge with lights strung along the cables. Hundreds of lights on streets and signs and windows, all of it throwing color against the cave ceiling in a way that made the whole space glow. Generators hummed somewhere deeper. Figures moved between buildings, Creeps, dozens of them, going about the ordinary business of lives that existed entirely beneath the notice of every clan in the city above.

Not even Lina would have found this, Mr Rabbit thought. No wonder we never saw them.

He said it differently out loud.

"How long?"

The green one, Kobb, his name was Kobb, told him twelve years. Six people and a drainage tunnel. He said it without sentiment, the way you describe something you've already made your feelings about.

The Curator had designed the structure. The Curator kept it running.

They crossed the bridge. The Creeps they passed looked up, took them in, and went back to what they were doing. Nobody stared. Mr Rabbit suspected that was intentional, a city that had survived by staying invisible would train its people not to advertise curiosity.

The command center was built into the rock face at the far end, low and long, every wall covered in screens and maps and things that had no obvious name. The door was open.

It was always open.

Inside, standing at a wide table covered in blueprints and biological diagrams, was The Curator.

Tall. Lean. White-haired, though not old in any way that suggested weakness, the kind of white that comes from decades of chemical exposure and not from age. He wore a long coat over dark clothing, sleeves pushed up, both hands occupied with work he didn't stop when they entered. He had the focused stillness of someone who had long ago stopped wasting energy on things that didn't require it.

He didn't look up.

"The rabbit," he said. "I was starting to think you weren't coming."

"I didn't know I was invited," Mr Rabbit said.

"You weren't." The Curator set down what he was holding and looked at him for the first time. His eyes were the particular grey of old circuitry, functional, precise, giving nothing away for free. "I just knew you'd come eventually. People in your position always do."

"And what position is that."

"Running out of time."

He explained it the way he explained everything, without decoration.

The Creeps were not born. They were made. People who had come to him broken, discarded, already halfway changed by the city's chemical runoff and genetic drift. He had taken what the city started and finished it. Each one different because each one started different. No template. A process.

"Can you make more," Mr Rabbit said.

"I can always make more." He crossed his arms. "The question is what you're bringing to the table. Because I don't arm people out of sentiment. Everyone who lives in the Seam earns their place."

The Seam. So that was what they called it.

Mr Rabbit was quiet for a moment.

"Supporters," he said finally. "More than you'd expect, and more coming. People who've been waiting for something worth believing in, inside the Warren and outside it. Some of them go back further than the clans do." He paused. "Old friends who've stayed quiet for the same reason everyone stays quiet. Because until now, there was nothing to stand behind."

The Curator said nothing. Listening.

"Alliances," Mr Rabbit continued. "The Creeps aren't the only ones who've been surviving in the gaps. There are others. I've been building toward this longer than the clans know. When I start calling in what I'm owed, you won't be looking at a handful of people."

"And when you can't call fast enough?"

"Weapons." He said it simply. "I know where they are. I know how to get them. I'll need time to collect, it can't happen overnight without drawing attention, but I can arm this city. Both of them."

Silence.

The Curator studied him the way he studied everything, like he was taking it apart to see which pieces were real.

"The clans have numbers," he said. "Infrastructure. Resources that compound every year they hold territory."

"I know."

"You're proposing to fight a war with people the city forgot existed."

"The city forgot about this place too," Mr Rabbit said. "Twelve years and three clans and none of them found you."

Something shifted in The Curator's expression. Not quite a smile, he didn't seem to be someone who smiled easily. But something.

"Sit down," he said.

They talked until the lights in the Seam had cycled through whatever passed for night.

When Mr Rabbit and Lina finally climbed back up, through the second level, the first, the sewers, the surface air hit like cold water.

Lina walked beside him without speaking until they reached the junction.

"He said yes?" she asked.

"He said he'd think about it," Mr Rabbit said. "For him I think that's the same thing."

She looked up. Somewhere above them, drones were running their patterns across the eastern block, methodical and patient, drawing smaller circles.

"We'll need the weapons before the clans move," she said.

"I know."

"How long?"

He thought about the places he'd left things. The people who owed him. The years of quiet preparation that had never been meant for a moment quite this specific, but would have to serve.

"Enough time," he said. "If we move now."

Below the city, a second city is waking up.

Above it, three clans are finishing their map.

Mr Rabbit has promises to collect.

Chapter 6 coming soon.