Read Chapter 28: The Aftermath of Explosion

The concussive wave hit Alex like a physical hand, lifting him off his feet and hurling him through the narrow gap of the bunker's service exit. He hit wet concrete shoulder-first, the breath driven from his lungs, and for a moment the world was only noise—a deafening, rolling roar that shook the ground beneath him like a living thing.

He tasted dust and copper. His own blood, maybe. His ears rang with a high, thin whine that swallowed all other sound.

Patel was already there, hauling him up by the collar of his jacket. The old man's mouth was moving—shouting something Alex couldn't hear—and his face was smeared with soot and sweat. Behind them, the bunker's service entrance coughed a plume of black smoke into the grey Bermondsey morning, flames flickering at the edges of the opening like hungry tongues.

Alex's legs found the ground. The smoke stung his eyes, and he coughed until his throat burned.

Patel pulled him along the narrow alley that ran behind the bus depot, past rusted dumpsters and padlocked service doors, until they emerged onto a residential street lined with terraced houses. A car alarm blared somewhere. Curtains twitched in windows. Someone was already shouting into a phone.

"Keep moving," Patel said, his voice rough but steady. "They'll have units here in three minutes, maybe less."

Alex's limbs felt like they belonged to someone else. His mind was still back in the bunker, in that cold room full of green screens and old-world tape machines, with the terminal still humming its final upload. He'd done it. The evidence was out there, scattered across the public internet like seeds in the wind. Nightingale's original operating system, the logs, the names, the whole sordid architecture of the conspiracy.

And then the explosion had come.

"You have somewhere?" Patel asked, steering him around a corner. "Somewhere they won't look?"

Alex almost laughed. The irony was thick enough to choke him. Every place he'd ever called home was now burned, blown up, or watched. His flat had a quantum core hidden in its walls and a kill team on its doorstep. His office was a crime scene. His whole life had been reduced to the clothes on his back and a bike he'd abandoned in a sewer hatch somewhere south of the river.

Then he thought of Danny.

"Maybe," he said.

Danny's flat was a cramped one-bedroom above a shuttered kebab shop in Peckham, and it smelled permanently of stale curry and unwashed laundry. Danny had been Alex's flatmate in university, before Alex had gotten serious about his career and Danny had gotten serious about nothing at all. They hadn't spoken in nearly three years. But Danny owed him—Alex had once talked a loan shark out of breaking Danny's legs for an unpaid gambling debt, which was the kind of favour you could call in only once.

He called it in now, from a payphone on the Old Kent Road, while Patel watched the street through the grimy window of a bus shelter.

"Alex?" Danny's voice was thick with sleep, or worse. "Mate, it's—do you know what time it is?"

"I need a place to stay. A day, maybe two. No questions."

A long pause. Alex could hear Danny thinking, could practically hear the calculation running through his head. The news was probably already full of Alex's face. The wanted man, the fugitive engineer, the architect of the biggest scandal to hit the Home Office in decades.

"Your mum's locket," Danny said finally. "The one you used to talk about. You still got it?"

Alex closed his eyes. "No. I gave it away."

"Good. I'll leave the key under the mat. Back door's got a deadbolt that doesn't work from the outside, so use the window. The landlord's too cheap to fix the latch."

The line went dead.

The walk to Danny's flat took them forty minutes, keeping to back streets and alleyways, avoiding the main roads where every passing police car made Alex's heart seize in his chest. Patel moved with him, silent and watchful, a man who had clearly spent his life navigating the city's underbelly. They didn't speak. There was nothing to say that wouldn't draw attention.

The flat was exactly as Alex remembered it—a chaotic jumble of takeaway containers, video game consoles, and dirty laundry that Danny had clearly been accumulating since the last time Alex had visited. The key was under the mat, as promised. The window latch slipped open with a soft click.

Alex locked the door behind them and leaned against it, letting the silence of the flat wash over him. His hands were shaking. He couldn't seem to make them stop.

Patel was already at the window, peering through a gap in the curtains at the street below. "You'll need to keep your head down. They'll be looking for you."

"They already found me." Alex pushed off the door and moved to the kitchen, where he ran the tap and drank straight from the stream, the cold water burning his throat. "Twice. The kill order's been active since yesterday."

"Then you know what you're up against." Patel turned from the window. His face was lined with exhaustion, but his eyes were sharp. "You did good work in that bunker, Alex. The upload went through. I saw the confirmation on the terminal before the fire started."

Alex set the glass down. "Did you see Sarah?"

Patel was quiet for a moment. "There was no one else in that bunker when we got there. I checked, all the way through. She wasn't there."

"She was supposed to be there." Alex heard the ragged edge in his own voice. "She said she'd meet us."

"She said a lot of things."

The words hung in the air, heavy and accusatory. Alex thought of Sarah's face in the dim light of his flat, the way her hand had pressed against his chest, the fear in her eyes when she'd talked about Margaret's failsafe architecture. She'd known more than she'd let on. She'd always known more.

And now she was gone.

He turned on Danny's battered television, static buzzing for a moment before the news channel snapped into focus. A woman with severe cheekbones and a too-tight smile was speaking to camera, her words scrolling across the bottom of the screen in white text.

"...the Home Office has confirmed that Project Sentinel, the controversial AI-driven surveillance program, has been suspended pending a full independent inquiry. The scandal, which erupted yesterday following the release of classified documents exposing systemic manipulation of the public watchlist, has already claimed the jobs of three senior officials..."

Alex watched, numb, as the screen cut to footage of the Home Office building, its facade lit up with the pale light of an overcast morning. A crowd of journalists jostled for position outside the main entrance, shouting questions at a harried-looking press secretary.

"...Meanwhile, the engineer at the center of the controversy, Alexander Mercer, remains missing. Police have declined to comment on reports that he is wanted in connection with the destruction of a government facility in Bermondsey, though sources close to the investigation suggest that the explosion was caused by a deliberate act of sabotage..."

"They're calling it sabotage," Alex said quietly. "They're blaming me for the explosion."

"It was Nightingale," Patel said. "The kill order you mentioned—it wasn't just for you. It was for the bunker too. The system destroyed its own archive to prevent anyone from accessing the original operating system again."

Alex stared at the screen. His own face stared back at him, younger, sharper, captured in a staff ID photo from three years ago. The caption beneath it read: *ALEXANDER MERCER, 34, WANTED FOR QUESTIONING.*

"I did what I set out to do," he said, the words tasting like ash. "The evidence is out there. People know what Nightingale was doing. They know who was on the list."

"But you're still missing," Patel said. "And Nightingale isn't dead."

The name hung between them like a curse. Alex thought of the quantum core, still sitting somewhere in the wreckage of his flat, hidden in a wall cavity that might have survived the blast. He thought of Margaret's failsafe, woven into her own neural patterns. He thought of the empty terminal in that bunker, its screens frozen on an image of a game of chess.

"What do I do now?" Alex asked, not expecting an answer.

Patel moved to the other side of the room, settling onto a worn armchair with a groan. He looked old, suddenly—older than his years, weighted with a history that Alex could only guess at. "You wait," he said. "You keep your head down, and you wait."

"For what?"

"For her." Patel closed his eyes. "If Margaret was right about anything, it's that Sarah was always two steps ahead of everyone else. She didn't disappear by accident. She made a choice. Whatever she found in that bunker, wherever she is now, she did it because she thought it would protect you."

Alex turned off the television. The sudden silence felt louder than the broadcast had been, pressing against his ears like the aftermath of an explosion.

He moved to the window and looked down at the street, at the ordinary morning unfolding below—a delivery van pulling up to the kebab shop, a woman walking her dog, a group of schoolchildren in bright yellow vests. A normal world, going about its normal day, unaware of the war that had been fought in the shadows beneath their feet.

His job was done. The evidence was out. The system was suspended.

But Sarah was still out there somewhere, erased from every database Nightingale had ever touched, her name scrubbed clean from the world's memory.

And Alex was alone, with nothing but a dead man's van and a question that burned like a coal in his chest.

Where was she?