The rear storage bay of Unit 4 was dark. He smelled of unpainted plywood racking, high-pressure fluid from the forklift. The cold, stone damp that seeped through the wet stonework of the estate’s boundary wall. Rain hammered against the corrugated spun-glass skylights fifty feet overhead, filtering the midday light into a sickly, waterlogged gray.
Ada Morland set her plastic check tote on an upturned wooden pallet. Beside her canvas tool roll, the tote held her standard council test gear. A yellow rubber-shrouded Fluke digital multimeter, a check endoscope with a flexible fiber-optic neck, a rechargeable lithium-ion penlight, and her personal mobile phone in a black rubber case.
In the corner of the bay, nestled between two towering racks of three-meter copper pipe lengths, the Courtesy Bridge stood open at its resting hum.
It wasn’t an explosion of sorcerous light. It was an oval rift in the air roughly six feet tall, its edges shimmering with the rainbow-bright sheen of diesel fuel floating on cold rainwater. Through the pale blue haze of the threshold, Ada could see the dim, shadow-streaked outline of the Lowbank washroom. The dark granite flat stone slabs, the white chalk boundary lines Pella had drawn on the floor, and the faint, flickering yellow glow of an animal fat candle burning near the open drainage grating.
The air drifting through the oval smelled entirely foreign. A heavy, salty silt stench that reminded her of the Humber mudflats at low tide, tinged with the sharp, acidic bite of wet coal smoke and the faint, bitter trace of copper green rust from ancient brass fixtures.
Ada didn’t pick up her tool roll.
In twenty-two years of commercial heating work, she had never turned on a high-pressure steam boiler without first testing the relief valves by hand. You didn’t trust a manufacturer’s certificate. You didn’t trust the word of the apprentice who said he had torqued the pipe rim bolts. You tested the clockwork limit yourself, with your own eyes and your own gauges, because if you were wrong, sixty gallons of white-hot water would blow the back kitchen walls into the back lane.
She picked up the Fluke multimeter from the plastic tote.
It was a heavy-duty-grade meter, model 87-V, ruggedized for commercial boiler rooms and high-voltage three-phase switchgear. She turned the central selector dial to direct-current voltage. The liquid crystal display lit up with a clean, high-contrast readout: 0.00 V DC.
She clipped the black ground probe to the meter’s rubber holster. She held the yellow plastic body in her right hand with her thumb braced against the selector knob.
Slowly, keeping her feet firmly planted on the oil-stained concrete of the Harrowby floor, Ada extended her arm.
She pushed the tip of the red test probe through the shimmering plane of the portal.
Nothing happened. The red probe—a four-inch needle of hardened stainless steel housed in injection-molded nylon—passed through the oval without pushback. On the Lowbank side, Pella was standing five feet back behind the chalk staging line. She watched the shiny steel tip emerge into the candlelit gloom.
“Probe is through,” Pella called out. Her voice was muffled, sounding as though she were speaking through a thick felt blanket. “No spark. No heat.”
Ada took half a step forward. She pushed the meter body forward until the upper half of the yellow plastic casing and the liquid crystal display crossed the threshold plane.
The effect was instant and total.
The liquid crystal display didn’t flicker. It dissolved. The neat black digits smeared into upright, jagged bars of black ink across the gray glass. The microchip driver lost its clock cycle in a split second. A cascade of broken hex-code gibberish stuttered across the seven-segment layout. Fragments of broken eights, inverted zeros, and uneven punctuation marks flashing at blinding speed.
Then the display went fully black.
Inside the yellow rubber case, the tiny piezo-electric warning beeper gave off a thin, strangled squeal that sounded like a dying mosquito, before choking into silence. The small lithium backup coin cell inside the battery compartment clicked twice, venting a faint, rotten-egg whiff of ozone.
Ada pulled her arm back.
The meter cleared the shimmering threshold and re-entered the cold air of the Harrowby warehouse. Then, the static field broke.
For five seconds, the meter lay dead in her palm. Then the internal charge bank drained its trapped charge into the ground rail. The display pulsed once with a dark gray flash, the microchip carried out its hard reset routine. The clean black numbers snapped back into existence: 0.00 V DC.
Ada looked down at the display. She reached into her pocket, pulled out an ordinary one-point-five-volt bitter-salt AA battery. Then she touched the red probe to the positive end-post.
The display responded right away: 1.58 V DC.
“The silicon doesn’t like it,” Ada said aloud, her voice flat and analytical. “The field scrambles the logic gates. It can’t maintain a clock pulse across the boundary.”
She picked up the rechargeable check penlight—a high-output light metal torch with an electronic soft-touch dimmer switch and a lithium-ion cell.
She held it by the tail-cap and thrust the lens through the oval.
The beam, which had been shining a bright white circle on the Harrowby floor, instantly broke into violent, strobe-like fluttering. The electronic driver circuit in the head of the torch began to buzz with a harsh, frying-pan sizzle. Through the light metal casing, Ada felt a distinct, prickly warmth spread into her fingertips as eddy currents induced themselves in the copper traces of the circuit board.
She yanked it back before the lithium cell could heat-runaway. When she pressed the tail-switch, the light was dead. The electronic switch had fused shut.
“Right,” Ada said, dropping the ruined torch into the plastic tote. “No transistors. No diodes. No printed circuits.”
She pulled her smartphone from her breast pocket. It was an ordinary work phone, its screen showing two missed calls from the council repair depot and a reminder that her van’s MOT check was due in three weeks.
She held the phone twelve inches from the portal threshold.
Even at that distance, the capacitive touchscreen began to register phantom taps. The screen flickered, jumping between the home screen and the settings menu as if an invisible finger were dragging across the glass. The cellular signal indicator in the top right corner plummeted from four bars of high-speed data down to a single bar, then to a red exclamation mark reading No Service. The battery percentage dropped from eighty-four percent to four percent in three seconds, with a high-pitched electronic whine from the internal power-management chip.
Ada took two full paces back.
The phone right away settled, the signal bars creeping back up as the local cell tower on the Harrowby water tank re-got the handset.
“Understood,” Ada muttered.
She walked out of the rear bay, letting the heavy sliding tin door rumble behind her. She walked through the steady rain to the cab of her white Transit van, opened the driver’s door. Then she began emptying her pockets onto the passenger seat with the brisk, unsentimental smooth speed of a surgeon preparing a running theater.
On the worn vinyl seat, she laid:
Her smartphone. Her digital Fluke multimeter. Her rechargeable headlamp. Her digital tire pressure gauge. Her cordless twelve-volt drill and its spare lithium battery pack.
She reached for her key ring. The van key had an electronic transponder head with buttons for remote central locking. Ada pulled out her pocketknife, pried open the plastic housing. Then she pulled out the emergency clockwork steel key blade. She clipped the bare steel key to her belt loop with a brass carabiner. That left the plastic fob with its battery and radio chip sitting on the dashboard next to the half-empty thermos of boiled tea.
She looked at her wrist.
Her watch was an old clockwork Smiths De Luxe, seventeen jewels. She was wrapped in stainless steel with a screw-down caseback. It had belonged to her uncle Arthur, who had worn it while firing locomotives on the London and North Eastern Railway. She wound the knurled crown twelve turns until the spring resisted her thumb. The sweep-second hand ticked forward with a crisp, clockwork heartbeat. Five beats every second, driven entirely by a coiled steel spring, a gear catch lever, and a tiny brass balance wheel swinging on ruby bearings.
She took her clockwork brass dial pressure gauge from the canvas tool roll, held it up to the portal light. Then she checked the needle. Dead on zero. Pure mechanics. A curved bronze tube that moved when air pushed against it. A geared brass pointer that translated that movement into numbers on an enamel plate.
She picked up her red and yellow grease pencils. Pure wax and pigment. No batteries needed to write a measurement on a pipe.
Ada picked up the canvas tool roll. It weighed six point eight pounds, clean, solid, and fully empty of modern silicon.
She walked back to the edge of the shimmering oval.
Through the sky-slit, Pella Rook was watching her from the Lowbank washroom. The young apprentice was standing beside the slate board, a dark oak-ink quill in her hand, her gray eyes steady.
“Two minutes to twelve-fifteen, Ada,” Pella called through the threshold. “The clockwork counter on the top door beam is engaged. Locked deposit is locked.”
“I’m ready, love,” Ada said, shifting the heavy canvas strap across her shoulder. “I had to leave the twenty-first century behind in the van. From here on, it’s just steel, brass, and whatever we can turn with an adjustable wrench.”
She adjusted the collar of her heavy cotton work jacket, checked the laces on her steel-toed boots. Then she took a long, steady breath of the damp Yorkshire air before stepping up to the red line.