1. The Brief

The rain began just after nine, a thin November drizzle that clung to the wool of Alistair Finch's overcoat like damp memories. He stood in the recessed doorway of a boarded-up chandler's shop on Cable Street, his left leg throbbing in quiet rebellion against the weather. The wound was old—a German bullet at Passchendaele that had shattered his tibia and any illusions he might have harbored about the romance of military service—but it still ached whenever the barometer dropped.

He shifted his weight onto his good leg and raised the small Leica camera to his eye for the dozenth time that morning.

The boarding house across the street squatted between a kosher butcher and a rag merchant's stall, its façade the color of old mustard. Number 47. The windows were dark, the curtains drawn against the gray light. A hand-painted sign nailed beside the door read ROOMS TO LET—NO IRISH, NO COLOREDS. Finch had seen worse sentiments expressed more politely elsewhere. The East End did not trouble itself with politeness.

At precisely twenty-three minutes past nine, the door creaked open and Thomas Granger emerged.

Finch depressed the shutter release. The tiny click was swallowed by the rattle of a costermonger's cart trundling past. He wound the film and took another exposure as the man paused on the threshold, blinking up at the sky like a mole unaccustomed to daylight.

Granger was thinner than his file photograph suggested—gaunt almost, the cheekbones prominent beneath skin the color of old parchment. He wore a patched tweed jacket and corduroy trousers shiny at the knees. His left hand gripped a walking stick with a brass duck's head handle, and he leaned upon it heavily, his right shoulder dipping with each labored step. The limp was pronounced, a dragging shuffle that sent small splashes of gutter water against his trouser cuffs. Either the man was genuinely afflicted, Finch mused, or he was the finest actor to emerge from the docks since Henry Irving.

The file from the National Insurance Society of Albion lay folded in Finch's breast pocket, its pages already soft from repeated reading. Thomas Peter Granger, age forty-two. Former stevedore at the West India Docks. Injured in March 1928 when a crane cable snapped and a cargo net filled with copper ingots swung into his lower back. Two surgeries at St. Bartholomew's Hospital. Permanent partial disability certified by three separate Harley Street consultants. Weekly benefit payments of thirty-two shillings, increased to thirty-eight in 1931 after a tribunal appeal.

And now, according to the letter from Mr. Archibald Hollis, Chief Investigator for the Society, a confidential informant had suggested that Granger's disability was not nearly so debilitating as the medical reports claimed. A man seen lifting crates at a warehouse in Shadwell. A man dancing at a public house in Whitechapel. A man whose limp mysteriously vanished when he thought no one was watching.

Finch had heard such claims before. In his experience, confidential informants were usually disgruntled neighbors, vengeful former spouses, or business rivals seeking to settle scores under the cloak of civic duty. But the Society paid well—five guineas per day plus expenses—and Finch's office on Bedford Street had accumulated three months of unpaid rent.

He pocketed the Leica and began to follow.

Granger moved with the slow, deliberate pace of a man who had learned to measure distance in units of pain. He paused at the corner to purchase a twist of tobacco from a newsagent's stand, his fingers fumbling with the coins. Then he turned north, away from the river, the tap-tap-drag of his walking stick establishing a rhythm against the cobblestones.

Finch maintained a distance of perhaps thirty yards, far enough back to avoid detection but close enough to observe. The technique was second nature now—the casual pauses to examine shop windows, the feigned interest in omnibus timetables, the ability to melt into the shadow of a doorway at the precise moment the quarry glanced over his shoulder.

Granger did not glance over his shoulder. Not once.

This in itself was unusual. The innocent tended to be oblivious; the guilty, hypervigilant. But Granger's obliviousness seemed almost studied, as though he had trained himself not to look back, not to acknowledge the possibility of pursuit. Finch filed the observation away and kept walking.

They passed the shuttered stalls of the Whitechapel Market and the imposing dome of the Royal London Hospital. The rain intensified, drumming against umbrellas and awnings, filling the gutters with swift brown water. Finch turned up the collar of his overcoat and pressed on.

It was near the entrance to the Underground station at Aldgate that he first felt it.

The sensation was not quite physical—not the weight of a stare between the shoulder blades, not the prickle of awareness that popular fiction so often described. It was subtler than that, a kind of echo, a disturbance in the fabric of the ordinary. Footsteps that matched his own, pausing when he paused. The same shadow crossing the reflection of a shop window two seconds after his own.

Finch was being followed.

He did not turn around immediately. Instead, he stopped at a tobacconist's window and studied the display of briar pipes and tins of St. Bruno flake, using the glass as a mirror. The street behind him was thick with pedestrians—typists and clerks hurrying to their offices, housewives with shopping baskets, a bobby walking his beat with ponderous dignity. Any one of them could have been his shadow. None of them seemed to be paying him the slightest attention.

Finch bought a packet of Player's Navy Cut from the tobacconist, a transaction that took perhaps forty seconds. When he resumed walking, the echo resumed with him.

He led the shadow on a meandering path through the City, past the Bank of England and the Mansion House, along the north bank of the Thames. Granger had stopped at a public house near Blackfriars—the Old Bell, a soot-stained establishment frequented by printers from the nearby newspaper offices—and was now settled at a corner table with a pint of mild ale. Finch took up position across the street, beneath the awning of a shuttered bookshop, and waited.

The echo had stopped too.

Whoever was following him had gone to ground, and the sudden absence of that invisible presence was almost more unsettling than its pursuit. Finch felt exposed, pinned to his observation post like a specimen to a board. His hand drifted unconsciously to the pocket where he kept his Webley revolver, then withdrew. This was London, not the Western Front. Whatever game was afoot, it was unlikely to require firearms.

He forced himself to focus on Granger.

The man was reading a newspaper, or pretending to. Every few minutes he would turn a page, his eyes scanning the columns of print with the glazed expression of someone whose mind was elsewhere entirely. His pint sat barely touched, the foam dying to a thin scum on the surface of the ale. At half past eleven, a woman entered the public house and sat down at his table.

She was not what Finch had expected.

The confidential informant's report had hinted at conspiracies—warehouse thefts, benefit fraud rings, organized deception on an industrial scale. But this woman did not belong to any criminal underworld Finch had ever encountered. She was perhaps forty, handsome rather than pretty, with graying hair pulled back in a severe bun. She wore a well-cut coat of dark blue wool, a fur stole draped over her shoulders, and carried a leather document case. She might have been a solicitor's clerk, or a hospital administrator, or the secretary to some minor government functionary. Respectable. Earnest. Entirely out of place in a printers' pub in Blackfriars.

Finch raised the Leica and took three quick exposures as the woman opened her document case and removed a sheaf of papers. Granger leaned forward, his gaunt face suddenly animated. They spoke for perhaps twenty minutes, their heads bent close together, the papers spread across the scarred oak table between them. At one point, the woman placed her hand on Granger's arm—a gesture of reassurance, Finch thought, or perhaps of pity.

Then she gathered up the papers, returned them to her case, and stood to leave. Granger rose as well, grasping his walking stick, and made as if to accompany her. She shook her head firmly and said something that made him sink back into his chair. A moment later, she was gone, swallowed by the lunchtime crowd on Blackfriars Road.

Finch made a decision. He would follow the woman.

Granger could wait. Granger was a known quantity, a name on a file, a face behind a disability claim. But this woman was a new element, an unexpected variable in an equation he had thought he understood. If the Society wanted to catch Granger in a lie, they would need to know who else was involved in the telling of it.

He stepped out from beneath the awning and began to walk east along the river, keeping the woman's blue coat in sight. She moved quickly, with the brisk efficiency of someone who knew exactly where she was going. At Ludgate Circus, she boarded an omnibus bound for Holborn. Finch hailed a taxicab and instructed the driver to follow.

The cabbie, a garrulous Welshman with a walrus mustache and opinions on everything from the government to the weather, attempted to engage Finch in conversation. Finch responded with monosyllables and kept his eyes fixed on the omnibus ahead. They turned north at Kingsway, passed the British Museum, and continued into Bloomsbury.

The woman alighted near Russell Square. Finch paid the cabbie, over-tipped to forestall any further conversation, and resumed his pursuit on foot.

She led him to a terrace of Georgian townhouses on a quiet street lined with plane trees. The brass plaque beside the door of Number 14 read: DR. ALASTAIR PEMBROKE, CONSULTANT IN ORTHOPEDIC MEDICINE. BY APPOINTMENT ONLY. The woman produced a key from her handbag and let herself in.

Finch stood on the opposite pavement, processing this new information. A Harley Street consultant. Granger's medical file listed three such specialists who had attested to his disability. Dr. Alastair Pembroke was not among them. And yet Granger was clearly connected to this practice, connected through the woman in the blue coat who visited him in public houses and held his hand with such tender familiarity.

He withdrew to a bench in the square gardens and spent the next two hours watching the house. Patients came and went—a stooped elderly man on crutches, a young woman with a pronounced limp, a boy in a spinal brace pushed in a bath chair by a harassed-looking mother. Dr. Pembroke, or whoever practiced within, clearly ran a legitimate medical office.

The woman did not reappear.

At three o'clock, with the afternoon light already fading to a November dusk, Finch admitted temporary defeat. He walked to the nearest Underground station and caught a train back to Whitechapel, his mind churning with unanswered questions. The woman. The doctor. The medical file that did not match Granger's actual behavior. None of it cohered into a clear picture, and this troubled him more than he cared to admit.

It was not until he emerged from the Underground at Aldgate East that he realized the echo had returned.

The footsteps were there again, matching his own stride for stride, pausing when he paused, resuming when he resumed. The same shadow flickering at the edge of his peripheral vision. The same prickle of awareness, no longer subtle but sharp and urgent as a blade pressed between the ribs.

Finch turned quickly, too quickly for an observer to react, and caught a glimpse of his pursuer.

The man was tall, broad-shouldered, standing perhaps forty yards back in the shadow of a railway arch. He wore a dark overcoat of military cut and a homburg hat pulled low over his brow. His posture was straight as a ramrod, his stillness absolute. Even at this distance, Finch could sense the coiled tension in that figure—the alertness of a predator, or a soldier.

Then a tram clattered past, bells ringing, and when it had passed, the archway was empty.

Finch stood motionless in the rain, his heart hammering against his ribs. He had seen that bearing before. In the trenches. In the faces of men who had learned to move through the world as though it were enemy territory.

He did not continue to his office on Bedford Street. Instead, he found a telephone kiosk on Commercial Road and placed a call to the National Insurance Society.

"Mr. Hollis, please. This is Finch."

The receptionist put him through after a lengthy pause filled with the clicking of switchboard connections. Archibald Hollis's voice, when it emerged from the crackling earpiece, was dry and precise as the ticking of a mantel clock.

"Finch. I trust you have progress to report."

"Perhaps. I need information on a woman."

"A woman? I was not aware Granger had a wife."

"He doesn't. This is someone else—a woman in her forties, well-dressed, carrying a legal document case. She met him this morning at a public house in Blackfriars. She has keys to an orthopedic practice in Bloomsbury."

The line went silent for a moment. Finch could hear the scratching of a pen.

"Describe her," Hollis said.

Finch did—the blue coat, the fur stole, the graying hair, the document case. As he spoke, he became aware of the absurdity of his situation, standing in a rain-spattered telephone kiosk while an unknown figure in a military greatcoat lurked somewhere in the November dusk, watching.

"There is nothing in the file about such a woman," Hollis said when Finch had finished. "The confidential informant made no mention of her. This is concerning, Finch. Most concerning."

"Who is your informant?"

"That is privileged information, I'm afraid. The Society guarantees anonymity to all—"

"I'm not asking for his name. I'm asking whether you trust him."

Another pause. Longer this time.

"The informant has provided reliable intelligence in the past," Hollis said carefully. "Two cases of confirmed fraud, both resulting in successful prosecution. The information regarding Granger came to us unsolicited, but it was detailed. Specific dates, specific locations, specific activities inconsistent with his claimed disability."

"And you've verified any of this?"

"We have not. That, Mr. Finch, is precisely what we are paying you to do."

Finch leaned his forehead against the cold glass of the kiosk window. The rain had intensified, hammering against the roof in a steady drumming. Outside, the streetlamps were beginning to glow, their amber light reflected in the wet pavement like scattered sovereigns.

"One more question," he said. "Has anyone else been assigned to this case? Another investigator, perhaps? Someone from your office?"

"No," Hollis said. "You are our sole operative in this matter. Why do you ask?"

Finch looked out through the rain-streaked glass. The street was empty now, the last of the commuters having hurried home to their firesides and their wireless sets. But at the far end of the pavement, just visible beneath the halo of the farthest lamp, a dark shape waited. Motionless. Patient. Watching.

"No reason," Finch said, and hung up the receiver.

He remained in the kiosk for a long moment, considering his options. He could confront the shadow directly—walk up to the man in the military coat and demand to know who he was and why he was following. But something told him this would be a mistake. Whoever the man was, he had not made any hostile move. He had simply watched, and waited, and echoed Finch's every movement through the streets of London.

There was also the possibility, slender but undeniable, that the shadow was connected to Granger's case in ways Finch could not yet perceive. If so, confrontation might drive him underground before his purpose could be understood.

No. Better to continue as before. To watch, and to wait, and to gather information. The shadow would reveal himself eventually. They always did.

Finch stepped out of the kiosk and began walking west, toward the City, toward his office with its unpaid rent and its overflowing ashtrays and its filing cabinet full of other people's secrets. The footsteps resumed behind him, steady as a metronome.

He did not look back again.

Somewhere behind him, in the deepening darkness of a London winter evening, the shadow followed. And in the days to come, Finch would learn that some shadows were not content simply to observe. Some shadows had teeth.