The lower archives were a labyrinth of rotting paper and cold stone. Lyra held the lantern high, the light flickering against the spines of massive ledgers. Caelan was a few paces behind her, his heavy boots echoing like a heartbeat in the narrow aisles. They were looking for the blueprints of the Sentinel Pass, the only land entrance to the Oakhaven valley.
"Thorne wiped the official maps clean," Caelan said, his voice muffled by the dust. "He wanted everyone to believe the only way in or out was through the rail lines he controlled. If there are old defenses, he likely buried the records under a century of nonsense."
Lyra stopped at a shelf marked with the seal of the Old Surveyors. She pulled out a tube of cracked leather and slid a heavy parchment onto a nearby table. The map was hand-drawn in faded blue ink. It showed the mountain range as a jagged wall of obsidian. At the narrowest point of the pass, there was a mark labeled the Black Pipe.
"What is this?" Lyra asked, pointing to the mark.
Caelan leaned in, his brow furrowed. "That is the old sluice system. Before the Foundation built the high reservoir, the city diverted mountain runoff through a series of pressurized tunnels. If you opened the main gates at the top, you could flood the entire pass in minutes. It was a defense of last resort."
"Is it still functional?"
"The pipes are iron," Caelan said, tracing the line with a calloused finger. "They don't rot, but they do rust. And the mechanism to open them is likely at the summit, right in the middle of a no-man's land. Thorne ignored it because he had the ironclads for protection. He didn't think anyone would ever march on Oakhaven from the peaks."
"Sterling thinks we are a province in waiting," Lyra said, her eyes fixed on the map. "He thinks he can just walk a Governor through the front door because we don't have a standing army. If we can prove that the mountain itself is a weapon, we change the math of the invasion."
"It is a suicide mission to reach the summit," Caelan warned. "The path is overgrown and the snow is already starting to pile up. You would need a team of climbers, not a group of blacksmiths."
"I don't need a team," Lyra said. "I need one person who knows how to fix a rusted gear. I need you, Caelan."
Caelan looked from the map to Lyra. The lantern light caught the grim set of his jaw. He didn't like the plan, but he understood the necessity. In Oakhaven, you either held the high ground or you were buried beneath it.
"We have ten days to finish the steel," Caelan reminded her. "If I am at the summit, I am not at the forge."
"Miller has the forge," Lyra said. "He proved that today. The city is learning to run itself, Caelan. Now we have to learn how to keep it. We leave at midnight."
They spent the next three hours gathering supplies. They took heavy coils of rope, climbing spikes, and a kit of specialized oil for the rusted valves. Lyra also packed the iron watch. It was no longer a trophy or a memento. It was a weight that kept her grounded.
As they prepared to exit the archives, Silas met them at the base of the stairs. He looked troubled, his usual bravado replaced by a restless energy.
"The word is out about Sterling," Silas said. "The people are talking about the protectorate. Some of the merchants think it is a good idea. They want the stability. They want the southern currency back in their pockets."
"Tell them the price of that currency is their children," Lyra said. "Tell them the Governor won't just tax their coin. He will tax their breath."
"I told them," Silas said. "But fear is a faster runner than the truth. You need to give them something to see, Lyra. They need a victory that isn't just a pile of steel on a pier."
"They will have one," Lyra promised. "Keep the peace in the streets, Silas. Don't let the merchants start a panic. We are going to the mountain."
Silas watched them go, his hand resting on the hilt of his iron bar. He didn't ask what they were doing. He knew better than to question the look on Lyra's face.
The night air was sharp and thin as Lyra and Caelan began their ascent. They avoided the main roads, sticking to the narrow goat paths that clung to the side of the cliffs. Below them, the lights of Oakhaven looked like a handful of embers scattered in the dark. Above them, the Sentinel Pass loomed like a giant, waiting to see if they were worthy of its secrets.
Lyra felt the sting of the wind on her cheeks. She felt the ache in her lungs. But she also felt a strange sense of freedom. For the first time in her life, she wasn't following a script written by a Sovereign. She was writing her own, and the ink was the sweat on her brow.
They reached the first ridge by dawn. The valley was hidden in a sea of clouds, but the peaks were bathed in a cold, golden light.
"The Black Pipe is just over that ridge," Caelan said, pointing to a jagged tooth of rock. "If we are lucky, the mechanism is still there. If we are unlucky, Thorne had it removed years ago."
"We aren't relying on luck anymore," Lyra said.
She began to climb, her fingers searching for a grip in the cold stone. The summit was waiting, and the Southern Coalition was still on the horizon. The ten-day clock was ticking, and the mountain was about to find its voice.