The train advanced through the English morning like an iron beast exhaling steam and impatience. Inside one of the second-class carriages, Sebastian Harrow sat by the window, motionless for nearly an hour. His eyes, however, were not fixed upon the gray fields sliding past beyond the glass; they were locked upon the envelope resting open upon his knee.
It was the letter.
He had read it so many times that he could almost recite it from memory. And yet he returned to it as a chemist returns repeatedly to the same substance, convinced that some new reaction might yet reveal itself under closer examination.
The train slowed as it approached the vast urban expanse of London, but Harrow seemed oblivious to it all. His fingers traced the edge of the paper while his mind dismantled and reconstructed every sentence written there.
"Dear Boss…"
The choice of word was curious.
Not sir, not doctor, not Mr. Doyle.
Boss.
A jocular term—almost provocative—as though the author were addressing a fictional character rather than a real man.
He opened his small notebook, an object already worn from use, and wrote in quick, precise handwriting:
The author of the letter does not fully distinguish between reality and fiction.
Beneath it, he added another observation:
He considers Sherlock Holmes a real entity—or at least wishes to treat him as such.
Harrow rested the pen against his lower lip and reflected.
The man who had written that letter did not merely wish to threaten.
He wished to engage in dialogue.
And that was infinitely more disturbing.
He withdrew from his pocket the scrap of paper bearing the line from The Gold-Bug, by Edgar Allan Poe:
"It was a very tall tulip tree, and I had already climbed nearly to the top when I noticed a large dead branch."
Harrow reread the sentence slowly.
The metaphor of a tree. An ascent. A dead branch.
Why choose that particular passage?
He wrote in the notebook:
Poe employed codes and riddles.
The author of the letter expects to be understood.
The train gave a long whistle. Minutes later, it pulled into the station.
Harrow slipped the notebook into the inner pocket of his coat and rose.
The investigation began now.
By the time he reached Whitechapel, the afternoon was already fading.
No description Harrow had ever heard had done justice to the place.
The first impression was sound.
Carriages, voices, laughter, arguments, footsteps, vendors crying out their wares, children running, dogs barking—all merged into a constant murmur that seemed to rise from the very stones of the street.
The second impression was the smell. Burned coal. Sour beer. Rotting fish.
And something more difficult to define—a mixture of dampness, sweat, and poverty that seemed to permeate the air.
Harrow walked slowly, absorbing every detail.
Gas lamps were already being lit, casting trembling circles of yellow light upon the uneven pavement. Small groups of men leaned against tavern walls, smoking and speaking in low voices.
Women dressed in gaudy fashion lingered at the corners.
Some of them watched Harrow with curiosity.
He did not resemble the usual inhabitants of the district.
His suit, though simple, was well tailored. His hat was clean. And there was in the way he moved a deliberate calm that stood in contrast to the restless urgency of the crowd.
Harrow took out his notebook again.
He wrote:
Whitechapel—extraordinary human density. A man could disappear here without leaving a trace.
He looked up.
Two children were playing with a metal hoop in the street, guiding it with a stick.
Behind them, a man slept slumped against a doorway.
A few yards away, a woman argued violently with a client.
Life went on. Even after the murder.
Harrow closed the notebook. It was time to visit Buck's Row.
The street was narrower than he had imagined.
And quieter.
While Whitechapel teemed with movement, Buck's Row seemed to exist in a kind of interval between two worlds.
Here, the distant noise of the city arrived muffled, as though filtered through invisible walls.
Harrow stopped in the middle of the street.
The place where the body had been found bore no visible mark. No sign indicated that, only nights before, a woman had been brutally murdered at that very spot.
Only silence.
He took a few steps. Observed the walls. The windows. The position of the lamps.
Then he opened his notebook once more. Insufficient lighting. After midnight, the street must remain almost completely dark.
He walked to the nearest lamp and examined it. Limited field of vision.
An assailant could approach unseen. Harrow raised his eyes.
The street offered two possible routes of escape.
Both led to busier thoroughfares.
He wrote:
The killer knew the area well. At that moment, he heard footsteps behind him.
He turned.
An elderly woman was sweeping the pavement in front of a doorway.
She watched him with curiosity.
"Looking for something, sir?"
Harrow approached her politely.
"Perhaps only trying to understand what happened here."
The woman sighed.
"A terrible thing, that was."
"Did you hear anything that night?"
She shook her head.
"Nothing. And I'm a light sleeper."
Harrow made a note. Swift attack.
The woman rested her chin on the handle of the broom.
"They say it was the work of a madman."
Harrow closed the notebook.
"Perhaps."
"Or a drunk."
"Perhaps."
She narrowed her eyes.
"Are you with the police?"
Harrow smiled faintly.
"Not exactly."
It was already night when Harrow returned to the busier part of Whitechapel.
The taverns were full.
Laughter, music, and arguments blended into an almost festive tumult.
It was a curious thought—that somewhere within that crowd might be walking the man who had written the letter.
Harrow leaned against a lamppost and observed.
Two prostitutes stood speaking near a corner.
One was young.
The other seemed to have seen many winters.
He approached them.
"Good evening, ladies."
The older one crossed her arms.
"Good evening, sir."
"May I ask you a few questions?"
She raised an eyebrow.
"That depends on the questions."
Harrow drew a few coins from his pocket.
"About the man who killed that poor woman."
The coins disappeared swiftly into her hand.
"What do you want to know?"
"Whether any strangers have been seen about here."
The younger one answered first.
"Strangers show up every night."
The older woman thought for a moment.
"There was one fellow, yes."
Harrow leaned in slightly.
"What sort of fellow?"
"Well dressed."
"That is not unusual?"
"Not at that hour."
Harrow made a quick note.
"What was he doing?"
The woman shrugged.
"Talking."
"About what?"
She hesitated.
"Strange things."
"Such as?"
"Books."
Harrow looked up.
"Books?"
"That's right."
The younger one laughed.
"Who comes to Whitechapel to talk about books?"
The older woman went on:
"He asked questions."
"What kind of questions?"
"About crimes."
Harrow closed the notebook slowly.
"Do you recall anything else?"
She frowned.
"He spoke… like a schoolmaster."
"A schoolmaster?"
"That's right."
The younger one added:
"And he had a book in his hand."
Harrow felt a subtle, intellectual shiver.
"Are you certain?"
"Quite certain."
"Do you remember the title?"
"I can't read, sir."
He thanked them and stepped away. It was not difficult to suppose that, after recent events, men of that description might have appeared in Whitechapel by the dozen.
The night deepened.
Harrow was leaving Whitechapel when he heard a voice behind him.
"Be careful, sir."
He turned. A young prostitute stood leaning against a post.
"With what?"
She shrugged.
"With the men around here."
Harrow smiled.
"That seems sound advice."
She tilted her head.
"Some of them look like gentlemen."
"And are they not?"
"Only until they're alone with us."
Harrow inclined his head in thanks and resumed his walk.
After a few steps, something made him stop.
A sensation.
The strange and persistent impression of being watched.
He turned quickly.
The street was nearly empty.
Only shadows.
Perhaps it had been nothing more than imagination.
Or perhaps not.
Harrow remained still for a few seconds.
Then he opened his notebook one last time.
And wrote:
The killer observes. Many observe. Yet no one offers anything truly meaningful. As though the body of a murdered prostitute, discarded among refuse, holds no greater significance than the refuse itself.
He closed the notebook. Slipped it into his pocket.
And disappeared into the darkness of the street.