Chapter 4 - Blueprints of Empire
Wren drank the water greedily, her lips brushing the rim of the crystal tumbler. She was acutely aware of his forearm behind her neck—the hard cord of muscle beneath his wool sleeve, the faint scent of rain, gun oil, and cedar that clung to him. He held her steady until she finished, then lowered her back to the pillows without lingering.
“What do you mean, use the bridge?” she asked, clearing her throat.
Cormac pulled a rolled sheaf of architectural schematics from the bottom drawer of an armoire and spread them across the foot of the bed. They were old blueprints, blue diazo prints with faded white lines, smelling of ammonia and mold.
“The Algiers machine shop at Berth Nine isn't just a warehouse,” Cormac said, tapping a calloused finger against the paper. “It was built in 1924 as the primary pump station for the dry dock system. The entire sub-structure sits on a timber piling grid below the water line.”
Wren squinted at the drawings. Despite the pain radiating through her thigh, her professional instincts took over. “The pilings are cypress. Submerged cypress doesn't rot unless it's exposed to oxygen.”
“It was exposed,” Cormac said. “Six years ago, Delacroix dredged the adjacent slip to accommodate deep-draft aggregate barges. They lowered the mudline by fourteen feet. What happened to the hydrostatic pressure under the floor?”
Wren leaned forward, ignoring the fire in her wound. Her finger traced the perimeter of the foundation walls on the print. “The silt matrix washed out. The slab is suspended. It’s essentially a hollow shell resting on unbraced vertical posts.”
“And the river is rising,” Cormac added. “The spring crest hit Carrollton gage at sixteen feet this afternoon.”
Wren looked up at him, understanding dawning behind her gray eyes. “Julian thinks he’s in a fortress. Concrete walls, two reinforced access doors, clear sightlines across the wharf.”
“He thinks he has me at an impasse,” Cormac said. “He expects me to come to the front door with a briefcase containing your thumb drive, or to send a team of breachers against steel security doors while he uses your sister as a sandbag.”
“You’re going to undermine the slab,” she whispered.
“I am going to flood the lower chamber,” Cormac corrected. “If we drop the sluice gate on the old drainage culvert three hundred yards upriver, the backpressure will blow the rotten timber footings out from under the eastern third of the workshop floor within ninety seconds.”
Wren studied the drawing, her mind racing through fluid dynamics calculations, hydrostatic head pressures, and soil shear resistance. Her brows drew together.
“No,” she said sharply.
Cormac stilled. “No?”
“Your math is wrong,” she said, looking straight into his eyes. “If you blow the sluice gate at high river stage, the backpressure won't just take the footings out. The sudden influx of two thousand cubic feet of water per second into that void will cause a hydraulic piston effect against the underside of the concrete floor. The entire slab will fracture upward, not drop down. If Sable is tied to a support column on that slab, the vertical displacement will crush her against the ceiling truss before the water even touches her feet.”
Cormac stared at her. The silence in the bedroom grew thick, heavy with the weight of two wills testing each other’s yield strength.
“You’re certain?” he asked.
“I spent four years calculating blast mitigation and hydraulic surges for the Army Corps of Engineers,” Wren said, her voice cold with professional certainty. “You don't blow the sluice gate. You drop the relief valve on the old discharge pipe behind the dry dock wall. You siphon the water out from under the silt base instead of forcing it in. The pressure differential will cause the slab to settle six feet in under twenty seconds—quietly. The steel doors will bind in their frames because the lintels will twist. Julian’s men won't be able to open their exits, and they’ll be too busy trying to keep their balance on a forty-degree floor slope to point a rifle at anyone.”
Cormac looked down at the blueprints, then at Wren. A faint, razor-thin smile touched the corner of his mouth—the first expression of genuine emotion she had seen on his face.
“You’re a dangerous woman, Miss Calloway.”
“I’m an engineer,” she said, her chest rising and falling heavily. “And I’m coming with you.”
“You can’t walk.”
“I don't need to walk to turn the relief valve,” she said, trying to swing her legs over the edge of the bed. “The bypass wheel is calibrated in foot-pounds of torque. You need someone who knows how to feather the valve, or you’ll cavitation-burst the line and drown my sister anyway.”
She put her left foot on the floor. She shifted her weight.
Her right leg gave out instantly, the stitched quadriceps screaming in white-hot agony. She gasped, tumbling forward toward the hardwood floor.
Cormac caught her before she dropped two inches.
His arms wrapped around her ribs, lifting her against his chest. She was panting, her forehead pressed against the curve of his neck, her hands gripping his shoulders for balance. He was warm, solid as structural granite, and for three long heartbeats, neither of them moved.
“You are not turning any valves,” Cormac murmured into her hair. His voice was dangerously low, vibrating through his chest into hers. “You are going to sit in the command vehicle, on a secure radio, and you are going to tell Teague precisely how many turns to give the wheel. If you try to stand again, Wren, I will have Pelletier sedate you until this entire city is quiet.”
She looked up at him, her lips inches from his throat. “Promise me she comes out alive.”
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“I don't make promises,” Cormac whispered, his eyes dark as river water at midnight. “I execute contracts. You gave me the Delacroix bridges. I give you your sister. That is the load we bear tonight.”
***
