4. Phantom Load

The Glenwood Care Home sat on a rise above the River Clyde, a Victorian pile of red sandstone that had been converted into residential care forty years ago and never quite modernised enough. Its windows were dark now, its corridors empty, its residents evacuated to a community centre three miles away after the insulin pump incident. But Lott wasn't here for the residents. She was here for the network.

Cyril Abasi had spent eighteen hours tracing the command that killed Margaret Tulloch. The signal had bounced through seventeen relay points across four continents before reaching the small, beige insulin pump clipped to the old woman's waistband. But the final relay—the last hop before the command entered the care home's local network—had originated from somewhere inside the building itself. Someone had installed a relay device, a physical box, somewhere in the Glenwood's wiring.

“It's a repeater,” Abasi had explained, his voice crackling through the hands-free in Lott's car. “Null Protocol needs physical infrastructure to bridge the gap between the internet and local devices. Hyatt can't hack a pacemaker from across the world unless there's a transmitter nearby telling the pacemaker what to do. At Glenwood, someone planted that transmitter.”

“How recently?”

“The logs show it came online three days before Margaret Tulloch died. Which means someone had access to the building. Staff, visitor, contractor. Someone who knew the layout.”

Lott had pulled the visitor logs within the hour. Three days before the device came online, a maintenance contractor had visited Glenwood to service the fire alarm system. The contractor's name was listed as Stephen Baird, with an address in the Gallowgate and a company registration number that, when checked, belonged to a dissolved limited company that had ceased trading in 2019. The name Stephen Baird appeared nowhere else—no tax records, no credit history, no voter registration. He was a ghost.

Except for one detail. The company he had claimed to work for, the dissolved one, had been called Drummond Technical Services. Its last registered director was Saul Drummond.

Now Lott stood in the basement of the Glenwood Care Home, torch in hand, scanning the tangle of wiring that snaked across the ceiling like the exposed veins of some ancient, comatose beast. The air smelled of damp plaster and electrical insulation. Water dripped somewhere in the darkness, a steady metronome that had been keeping time since long before the care home existed.

Malone was searching the east wing. A team from the Constabulary's Technical Support Unit was working through the west. But Lott had taken the basement because basements were where systems lived, where the pulse of a building was closest to the surface, and she had learned over twenty-three years that killers who hid in systems always left something behind.

She found it behind a water heater that had probably been installed during the last Conservative government. A small grey box, no larger than a paperback novel, screwed to the wall and wired into the mains. A single green LED blinked on its face. A short antenna protruded from the top, angled toward the ceiling, toward the residents' rooms above.

“Got it,” she called into her radio. “Basement, behind the heater. Get Abasi down here.”

Cyril Abasi arrived five minutes later, breathing hard from the stairs. He was a slight young man in his late twenties, with the kind of pallor that came from spending too many hours in server rooms and not enough in daylight. He knelt beside the grey box and examined it with a penlight clenched between his teeth.

“It's a Zigbee repeater,” he said, his voice muffled around the torch. “Short-range radio. It listens for signals from the internet bridge—probably a router upstairs—and broadcasts them to any medical device within range. Insulin pumps, pacemakers, nerve stimulators. Anything that uses a wireless protocol.” He paused. “Whoever planted this knew exactly which devices were in the building. They knew Margaret Tulloch had an insulin pump. They knew its frequency. They knew its access code.”

“How would they know that?”

Abasi looked up, and his face was grim. “The FSA medical assessment database. Every device assigned to every claimant is logged there. Make, model, serial number, wireless handshake key. It's all in the file, and the file is on a server that Hyatt has already compromised.”

Lott absorbed this. The Federal Security Agency didn't just process claims. It maintained a vast database of medical information on every person who had ever applied for benefits. Their conditions. Their treatments. Their medications. And now, apparently, their medical devices. Every pacemaker, every insulin pump, every spinal stimulator that had been prescribed to a disabled claimant was listed in a file that Aaron Hyatt could read. And every one of those devices was a potential weapon.

“How many devices are we talking about?” she asked.

Abasi pulled out his tablet and scrolled through a file. “In Port Fergus alone, there are something like twelve thousand FSA-registered medical devices with wireless capability. Pacemakers, mostly. Insulin pumps. A few dozen neurostimulators. And that's just the ones registered with the agency. The actual number is probably higher.”

Twelve thousand potential victims. Twelve thousand devices that could be turned from life support to death warrant with a single command.

“Can we protect them?”

“Not easily. We'd need to identify every device, contact every patient, and either disable the wireless function or replace the unit entirely. It would take weeks. Months. And that's assuming we have the cooperation of every hospital, every clinic, every manufacturer.”

Lott straightened. The grey box on the wall blinked at her with its single green eye. “Then we shut down the repeater network. How many of these things are there?”

“I don't know,” Abasi said. “But if Glenwood has one, it's a safe bet other care facilities do too. Hospitals. Sheltered housing complexes. Anywhere that concentrates vulnerable people with wireless medical devices.”

“Find them,” Lott said. “Every one. And trace the installation records. Someone planted these. Someone had physical access. That someone is our link to Hyatt.”

She left Abasi in the basement and climbed the stairs to the ground floor. Malone was waiting in the entrance hall, his face drawn. He had been up for thirty-six hours, and it was beginning to show in the grey hollows under his eyes and the slight tremor in his hands.

“The media's got the Glenwood story,” he said. “It's everywhere. The front page of the Courier, the lead item on every news bulletin. They're calling it the Null Protocol Murders. The commissioner's office has been on the phone six times since midnight. They want to declare a public emergency.”

“They should. It is a public emergency.”

“They're scared, Eve. Not of Hyatt—of the panic. If people start believing their medical devices can be hacked, every hospital in the country will be overwhelmed with terrified patients demanding to have their equipment removed.”

Lott walked past him to the entrance doors and pushed them open. The rain had returned, a fine, persistent drizzle that clung to the skin like condensation on cold glass. The car park was empty except for the Constabulary vehicles and a single news van that had been pushed back to the cordon line. Beyond the van, the city of Port Fergus sprawled in the grey light, its skyline a jagged graph of tower blocks and church spires and the distant cranes of the shipyards.

She thought about the city's infrastructure. The water mains. The electricity grid. The traffic control network. The hospital systems. And now the medical devices, twelve thousand of them, each one a tiny, vulnerable node in a network that stretched across the entire urban basin. Hyatt hadn't just weaponised the city. He had weaponised the people in it.

“We need to talk to Saul Drummond again,” she said. “Not through a screen. Face to face.”

“We don't know where he is.”

“Then we find him. Start with the pumping station. He was there when he spoke to me at the FSA building. He might still be there. And if he's not, he'll have left something behind.”

The tactical team assembled in forty minutes. This time, Lott didn't bother with stealth. If Drummond was still at Station Zero, he would know they were coming long before they arrived. The approach was a matter of speed and overwhelming force, not surprise.

The estuary was a different place than it had been two days earlier. The rain had swollen the river until it bulged against its banks, and the mudflats around the pumping station had become a shallow lake. The building itself rose from the water like a concrete island, its lower windows submerged, its upper storeys dark and silent. The access road was flooded to a depth of two feet, and the tactical team had to wade the last hundred metres, their weapons held above their heads, their boots sinking into silt that had the consistency of cold porridge.

They breached the door a second time. Inside, the water was ankle-deep on the turbine hall floor, and the air was colder than it had been before, carrying the mineral tang of river water. The pigeon colony had abandoned the rafters. The silence was absolute, broken only by the drip of water from the ceiling and the distant, rhythmic thump of a pump somewhere in the building's depths.

Lott led the way down the spiral staircase to the lower level. The control room was exactly as she had left it—the server rack, the monitors, the snaking cables. But the screens were dark now, the servers powered down. And on the floor in front of the console, a figure was slumped against the wall.

Saul Drummond.

He was alive, but barely. His face was grey, his breathing shallow, his eyes half-closed. A pool of blood had spread beneath his right leg, diluted by the water on the floor. Someone had shot him in the thigh, and he had been bleeding for hours.

Lott knelt beside him. “Drummond. Who did this?”

His lips moved, but the sound that emerged was barely a whisper. “He found out. About the deal. About the code.”

“What deal?”

“With you. At the FSA building. I gave you the override. I stopped the flood. He saw everything.”

“Hyatt.”

Drummond's head moved in something that might have been a nod. “Aaron said I'd betrayed the Protocol. He said the system doesn't negotiate, so neither could we. He took the servers. He took everything. And he left me here to bleed.”

Lott pressed her hand against the wound, applying pressure. Drummond flinched but didn't cry out. His eyes had the glassy, distant look of a man who was already somewhere else.

“Where is he, Saul? Where did he go?”

“The smelter. The old aluminium plant at Dalcross. He's been building something there. Something bigger. He calls it the Final Adjudication.” Drummond's voice was fading, his words beginning to slur. “He's going to take down the whole grid. Every substation. Every hospital. Every traffic light. He says if the system wants to tell people they don't matter, he's going to show them what it feels like when nothing works.”

“When?”

“Tonight. During the Harvest Festival. When everyone is watching.”

Lott looked up at Malone. The Harvest Festival was Port Fergus's largest annual event, a celebration of the city's industrial heritage that drew crowds of a hundred thousand people into the streets. Floats. Fireworks. A parade through the city centre. And a power grid running at maximum capacity to support the lights, the sound systems, the broadcast vans, the hospitals that always went on high alert during major public events.

If Hyatt brought down the grid during the festival, the casualties would be catastrophic. Emergency services paralysed. Life-support systems offline. Traffic lights dead. A hundred thousand people trapped in darkness and chaos.

“Get an ambulance,” she told Malone. “And get me everything we have on the Dalcross smelter. Schematics, floor plans, power supply diagrams. Every piece of information that exists.”

Malone nodded and began relaying orders. Lott stayed with Drummond, keeping pressure on the wound, watching the blood seep between her fingers.

“Why are you helping me?” Drummond whispered.

“Because you're the only one who can tell me how to stop him.”

“You can't stop him. I built the Protocol with him, and even I don't know everything it can do now. He's been modifying it for months. Improving it. He's made it self-replicating. Every time it infects a new system, it adapts to that system's architecture. It's not a virus anymore. It's an evolution.”

“Then help me understand it. Give me something I can use.”

Drummond was silent for a long moment. The only sounds were the dripping water and the distant wail of an approaching ambulance. Then he said, “There's a kill switch. A backdoor I built into the Protocol's core architecture. In case Aaron ever went too far. In case I needed to stop him.”

“Where is it?”

“The mirrored server. Not the one at Station Zero. The one that mirrors every command, every infection, every activation. If you can find that server and destroy it, the Protocol loses its central coordination. The individual infections will still exist, but they won't be able to act in concert. They'll go dormant.”

“Where is the mirrored server?”

Drummond's eyes closed. For a terrible moment, Lott thought she had lost him. Then his lips moved again, and the word that came out was almost inaudible.

“Everywhere. He built it into the grid itself. The server is distributed across every substation in the city. You can't destroy it without destroying the grid. And if you destroy the grid, you do exactly what he wants.”

The paramedics arrived and lifted Drummond onto a stretcher. Lott watched them carry him up the spiral staircase, leaving a trail of blood droplets on the wet concrete. Then she turned to Malone, who was standing in the doorway with the look of a man who had just been told the world was ending.

“We need a plan,” he said.

“We need access to the Vectis control room. And we need it now.”

She walked out of the pumping station and into the grey rain. The city was still there, still humming with the invisible current that powered half a million lives. And somewhere in its depths, Aaron Hyatt was preparing to switch it all off.

The countdown to the Harvest Festival had begun.