The heavy vibrations of the tactical breaching saws began to hum through the concrete walls of the bridge pillar. It was a rhythmic, grinding sound. The sound of the Blackwood Syndicate coming to reclaim their secrets.
"They're through the outer thermal seal," Caspian said, his fingers flying across the ancient console. He was bypassing security layers that had been dormant for a decade. "Nora, if we're going to do this, we do it now. Once the pressure in the stabilizer tanks drops, the bridge becomes a tuning fork. If your father's math is off by even a decimal point..."
"It's not," Nora snapped, her eyes locked on the final pages of the Blackwood Ledger. "My father was many things, but he was never wrong about structural integrity. He didn't build a kill-switch to destroy the bridge, Caspian. He built it to protect the city from people like them."
She pointed to a specific sequence of numbers; the "Ratio of Grace" applied to a mechanical harmonic. "Here. Trigger the hydraulic dampeners in reverse. Instead of absorbing the vibration from the traffic, we're going to amplify it."
Caspian slammed his hand onto the final command.
For a heartbeat, nothing happened. Then, a low, subsonic growl began to emanate from the very marrow of the bridge. It started as a hum in Nora's teeth, then grew into a roar that shook the air in her lungs.
Above them, the black SUVs of the Syndicate began to bounce. Not from an earthquake, but from a rhythmic, violent oscillation. The tactical teams outside the pillar lost their footing, their breaching saws kicking back as the concrete they were trying to cut began to vibrate at a frequency that shattered glass.
"It's working," Nora whispered, watching the external monitors. The Syndicate's "Wraiths" were staggering, their high-tech visors failing as the sonic resonance scrambled their sensors.
"We have a ninety-second window before the emergency brakes kick in automatically," Caspian shouted over the mounting roar. "The river is our only exit. There's a maintenance chute in the floor that drops directly into the Northport bay."
He grabbed a heavy waterproof case and shoved the Ledger inside, strapping it to Nora's back. "You go first. The current is strong, but there's a sub-surface buoy marked with a Thorne beacon. Find it and stay under the pier."
"Not without you," Nora said, grabbing his arm. The bridge was now screaming, the sound of stressed steel singing a violent aria.
"I'm right behind you," Caspian promised, his dark eyes fierce. "I just have to make sure this console melts, so they can't reverse the sequence."
He kicked open the circular hatch in the center of the floor. Below, the dark, churning waters of the bay looked like an inviting grave.
Nora didn't hesitate. She had spent her life building structures to withstand the elements; now, she was trusting the elements to save her. She stepped into the void.
The fall was a blur of freezing air and the scent of salt. She hit the water like a stone, the coldness instantly stealing her breath. The current was a physical hand, dragging her deep into the darkness of the bay.
She fought toward the surface, her lungs burning. When she finally broke the water, the sight above was magnificent and terrifying. The Northport Bridge was glowing under the emergency lights, vibrating so violently that the Syndicate's vehicles were being tossed around like toys.
A second later, a dark shape hit the water twenty feet away.
Caspian surfaced, his hair slicked back, looking like a vengeful sea god. He swam toward her, his powerful strokes cutting through the chop. "The buoy! This way!"
They reached the shelter of the old stone piers just as a massive explosion rocked the bridge pillar they had just escaped. A plume of orange fire lit up the sky, casting long, dancing shadows over the water.
Nora clung to the barnacle-crusted wood of the pier, gasping for air. She looked up at the burning bridge, then at Caspian. They were wet, freezing, and hunted by the most powerful organization in the city, but for the first time in years, Nora felt entirely, dangerously free.
"They think we're dead," Nora coughed, a cold smile touching her lips.
"Let them think it," Caspian said, pulling himself up beside her. He looked at the waterproof bag on her back. "We have the Ledger. We have the Aegis Protocol. And now, we have the ghost of Alistair Quinn on our side."
Nora looked out at the Northport skyline. The Sterling building stood tall and arrogant in the distance, unaware that the woman they had cast out was now the only one who knew how to pull the plug.
"Julian is going to find out tomorrow that his 'dead' ex-wife just inherited a ghost," Nora whispered. "And the ghost is hungry."