London woke under a low, colourless sky, the kind that made the Thames look like a strip of beaten steel. The morning rush had begun its slow churn along Southbank: joggers weaving between tourists, cyclists ringing their bells, office workers clutching coffees like lifelines. The city felt half‑awake, half‑watchful.

Jake Hunter stood by the railings near Waterloo Bridge, hands in his pockets, posture loose. To anyone passing, he looked like a man waiting for someone late. But his eyes were scanning — reflections in windows, angles of approach, the rhythm of the crowd. He wasn’t waiting. He was hunting.

Emma Clarke approached from behind, blending into the flow of commuters. She didn’t look at him as she stopped beside him.

“Control just confirmed,” she murmured. “Mercer tripped a CCTV node near the National Theatre. Forty minutes ago.”

Jake didn’t react outwardly, but something tightened in his chest. “He’s close, then.”

“Close enough to smell the coffee,” Emma said. “But he’ll know we’re here.”

Jake exhaled slowly. “He always knows.”

Daniel Mercer. Former MI5 surveillance instructor. A man who could disappear in a corridor with only one exit. A man who had trained Jake and Emma in the art of not being seen — and then vanished with a classified data pack containing the identities of covert assets across Europe.

Three weeks missing. Three weeks of silence. Three weeks of MI5 scrambling to contain the fallout.

Emma nudged her chin toward the river walkway. “Movement. Ten o’clock.”

Jake saw him instantly.

A hooded figure, walking with a familiar, economical stride — the stride of someone who measured distance in escape routes, not steps. Shoulders slightly hunched. Head angled just enough to catch reflections in the glass of passing buildings.

Mercer.

Jake’s pulse steadied. “Target visual. Southbank. Moving east.”

Emma peeled off without a word, slipping into the crowd like a shadow. Jake followed at a distance, keeping Mercer in the corner of his vision.

The strange thing was… Mercer didn’t look back.

Not once.

That was wrong. Mercer always looked back. He’d drilled it into them: “If you don’t check your six, you don’t deserve to have one.”

Jake murmured into his mic, “He’s not counter‑surveilling.”

Emma’s voice crackled softly. “Which means either he’s confident… or he’s scared.”

Jake wasn’t sure which was worse.

Mercer passed the National Theatre, weaving between a group of tourists. He didn’t speed up. Didn’t slow down. Just kept moving with that same deliberate pace.

Emma’s voice came through again. “He’s heading toward the cafés. If he cuts right, he’ll hit the service alley.”

Jake’s jaw tightened. “He’s leading us.”

“Or he’s cornered.”

Jake wasn’t convinced. Mercer didn’t get cornered. He chose his ground.

And right now, he was choosing theirs.

Mercer slipped between two cafés, disappearing into a narrow service alley lined with bins and delivery crates.

Jake moved.

He entered from the west side, steps quiet, controlled. Emma circled to the east, her silhouette briefly visible at the far end.

The alley was dim, lit only by a flickering security light. The air smelled of damp cardboard and burnt coffee grounds.

Jake stopped three metres from Mercer’s back.

“Daniel,” he said quietly. “It’s over.”

Mercer didn’t turn immediately. When he did, it was slow, deliberate. His hood fell back slightly, revealing a face that looked older than Jake remembered — thinner, paler, eyes ringed with exhaustion. But the sharpness was still there. The intelligence. The calculation.

“You’re good, Jake,” Mercer said softly. “But not good enough.”

Emma stepped into view behind him. “Drop the bag.”

Mercer looked between them, then let the small black satchel slip from his shoulder. It hit the ground with a dull thud.

“I’m not your enemy,” he said.

Jake kept his weapon holstered but ready. “You stole classified data. You vanished. You ran.”

Mercer shook his head. “I didn’t run from MI5. I ran from the person inside MI5 who wants that data erased.”

Emma’s eyes narrowed. “Erased?”

Mercer nodded. “Every name on that drive is a target. Someone inside the Directorate is selling them off.”

Jake felt a cold weight settle in his stomach. “You’re accusing a senior officer.”

“I’m accusing the one who ordered Operation Captura,” Mercer said. “Because Captura isn’t a retrieval mission. It’s a purge.”

Emma stepped closer. “Name.”

Mercer opened his mouth—

A metallic click echoed above them.

Jake’s instincts screamed.

He looked up.

A silhouette on the rooftop. Rifle. Suppressed barrel.

“DOWN!”

The shot cracked the air like a whip. Stone splintered inches from Emma’s head.

Jake lunged behind a bin. Emma dove sideways. Mercer dropped flat.

Another shot. Controlled. Professional.

Jake shouted, “Emma, move!”

She rolled behind a stack of crates, breath sharp. “Shooter’s repositioning!”

Mercer scrambled to his feet. “They’re not here for you!”

Jake yelled, “Then who—”

Mercer sprinted.

Out of the alley. Into the crowd.

Jake swore and took off after him.

Behind him, Emma shouted, “I’ll take the roof!”

Jake didn’t look back.

Mercer was running — fast, desperate, and not looking behind him at all.

Which meant one thing.

He wasn’t running from MI5.

He was running from whoever had just tried to kill him.

And Jake and Emma were now caught in the crossfire.