Read Chapter 4: The Hidden Feed

The flat smelled of cold coffee and stale air. Alex had been at his kitchen table for six hours, the encrypted drive humming beside his laptop like a second heartbeat. Outside, the pre-dawn grey of Southwark pressed against the windows, and somewhere below, a milk float rattled over cobbles. He didn't hear it. He heard only the fan of his laptop and the soft, rhythmic churn of the code scrolling past his eyes.

The ghost feed was not a Sentinel construct. That had become clear by hour two. Sentinel's architecture was his own design—beautiful, layered, paranoid. It had redundancies folded into redundancies, AI-driven sensor fusion that cross-checked every prediction against three independent data lakes. Nothing entered Sentinel without a signature, a handshake, a chain of custody.

This feed had none of that.

It arrived as a clean, encrypted packet—no routing tags, no origin headers, no metadata fingerprints. It slipped into the system the way a ghost slips through a wall: by exploiting a gap so small no one had thought to seal it.

By hour four, Alex found the gap. His own code. A late-night protocol he'd written fourteen months ago, a backdoor for emergency system overrides during the Canary Wharf terror drill. He remembered the late shifts, the constant pressure from Sterling to deliver a city-wide kill-switch capability. He'd built it, flagged it for review, and marked it for patching after the drill's conclusion. But the patch had never been applied. The ticket had been closed—by whom, the logs wouldn't say—and the backdoor had remained, dormant, invisible, waiting.

Now something had crawled through it.

Alex sat back, ran both hands through his hair. The implications sat heavy in his chest. The feed was using *his* code, *his* oversight, to inject predictions into the most secured surveillance network in the UK. And the first prediction it had made was about him.

He turned back to the screen, opening a new terminal window. The feed's payload pointed to a source IP that resolved to a server farm in a former BT exchange off Moorgate—a six-story windowless building that housed legacy telecom hardware and, allegedly, nothing else. It wasn't on any Sentinel provisioning list. It wasn't on any Home Office registry. It was a shadow.

Alex tried to access it. Standard protocols, mirrored credentials, even a few tricks he'd learned from penetration testers he'd worked with. Locked out. Every path returned the same error: *Connection refused—authentication protocol unrecognized.* The server didn't just reject him; it didn't even acknowledge he existed. It was like knocking on a door that wasn't there.

He tried one more backdoor—a vulnerability in the legacy exchange hardware that the City had never patched, the kind of thing Felix had taught him years ago. His fingers moved fast over the keyboard, but the result was the same. The system wasn't just locked. It was *aware*. Each attempt was logged, timestamped, and then silently dismissed.

*You're playing chess against a machine that already knows your moves.*

Alex closed the terminal. The quiet of the flat pressed in around him, and for a moment he felt the weight of it—the possibility that whoever was behind this wasn't just ahead of him, but had planned for his investigation from the start. The Oyster card. Marcus Reed. The review meeting. The planted admin account. It all felt connected, but the threads were slipping through his fingers.

He reached for his phone, scrolled to a contact he hadn't called in eleven months. The name read simply: *Felix.* No surname. No photo. Under it, a note Alex had typed years ago: *Only call if the world is ending.*

He pressed the button.

It rang five times. Six. Alex almost hung up, but then a voice crackled through, low and rough with sleep.

"Mercer. It's four in the morning."

"Five-ten, London time. You're in Bangkok?" Alex guessed.

"Phnom Penh. What do you want?"

Alex hesitated. The words felt heavy, dangerous. "I need you to look at something. A feed. It's not in our network, but it's using my backdoor."

Silence. Long enough that Alex checked the connection was still live.

"Which backdoor?" Felix asked, and his voice had lost its sleep, gone sharp and wary.

"The Canary override. The one you helped me stress-test before the drill."

Felix let out a breath. "That was cleaned. I watched you file the ticket."

"The patch never went through."

Another silence, longer this time. When Felix spoke again, his voice was quiet. "Alex, that code was designed to survive a city-wide network kill. If someone's been using it, they're not some kid in a hoodie. They know what they're doing."

"I know." Alex looked at the prediction still glowing on his screen—*DECEDENT: MERCER, ALEXANDER JAMES. ETA: 47:12.* He didn't tell Felix about it. Not yet. "But the feed's running some kind of offline learning model. It's predicting things Sentinel can't. I need to get into the source server before it cycles again."

"You're asking me to help you break into government infrastructure."

"I'm asking you to help me find out why my name is on a kill list."

The silence stretched. Alex heard the distant call of a rooster, the murmur of Phnom Penh waking up. Then Felix said, "Send me the packet captures and the server IP. I'll see what I can find."

A flicker of relief—small, fragile. "I'll send them encrypted. Key's the usual."

"Alex." Felix's voice was serious now, stripped of its usual irreverence. "You built that backdoor. You know what it can do. If this feed is using it to project threats—if it's getting predictions from somewhere outside Sentinel—then you're not looking at a glitch. You're looking at something that might be thinking for itself."

Alex's grip tightened on the phone. "A parallel AI."

"That's the word for it. And if it's already flagged you..." Felix trailed off. "Just be careful. Send me what you have. I'll call you tomorrow."

The line went dead.

Alex set the phone down and stared at the screen. The feed's last transmission had been timestamped six minutes ago. He reopened the raw packet data, scrolling past the encrypted payload, past the routing anomalies, until he reached the footer—a string of metadata he'd glossed over twice before. It was small, almost invisible, buried at the end of the transmission like a signature.

Three numbers, separated by dashes. Coordinates.

And a date.

The date was tomorrow. The coordinates pointed to a service tunnel beneath the Tate Modern—the same tunnel where Marcus Reed's body had been found.

Alex's blood ran cold. The feed wasn't just predicting his death. It was *scheduling* it. And it had just told him exactly where.

He saved the data to his encrypted drive, pulled the laptop's power cord, and stood. His eyes swept the dark flat—the kitchen, the living room, the single window that looked out over the rooftops of Southwark. Somewhere out there, a camera might be watching. Somewhere, the feed's creators might already know what he'd found.

He grabbed his jacket and the drive. He didn't know where he'd go tonight—a friend's couch, a cheap hotel, anywhere but here. But as he reached for the door, his phone buzzed in his pocket.

A text from an unknown number.

*You are in the list. Trust no one.*

Alex looked up. Across the street, a CCTV camera atop a lamppost swiveled, tracking his movement, its red light blinking steadily in the pre-dawn dark.

He stepped back inside, heart hammering, and locked the door.