The tunnel seemed endless.
Alexander slowed his pace as the narrow maintenance passage gradually widened into an old brick corridor.
The sound of rushing water echoed somewhere beneath their feet.
He raised a hand.
Evelyn stopped immediately.
No questions.
She had learned that much.
Alexander crouched beside the wall.
His fingers brushed against the damp bricks before tracing a faint scratch carved into the mortar.
One line.
Then another crossing it.
An ordinary person would have dismissed it as damage.
Alexander didn't.
Someone had marked this passage.
Recently.
He stood.
"We're changing direction."
Evelyn looked ahead.
"But the exit is this way."
He shook his head.
"Exactly."
---
Several streets away...
The older operative studied the underground survey spread across the bonnet of the black motorcar.
He drew three circles.
Three exits.
Three possible escape routes.
Then he calmly crossed one out.
"They won't use this one."
The younger operative frowned.
"How can you be sure?"
"The man with her."
He folded the map.
"He'll assume we're waiting."
"So he'll choose another exit."
The younger man nodded.
"And if he doesn't?"
The older operative smiled faintly.
"Then he isn't the man I think he is."
---
Scotland Yard...
Arthur emerged from the tunnel covered in coal dust.
His coat was stained.
His hands were blackened.
He barely noticed.
Collins climbed out behind him.
"We've lost them."
Arthur looked back at the concealed entrance beneath Evelyn's pantry.
"No."
"We've fallen behind them."
There was a difference.
He accepted a notebook from one of the constables.
"Witness statements?"
"Yes, Inspector."
Arthur began reading immediately.
Most were useless.
"I heard shouting."
"I heard three shots."
"I saw two men running."
Then...
One statement caught his attention.
From an elderly widow living opposite Evelyn's apartment.
Arthur read it aloud.
«"The gentleman who rescued the young lady removed his hat before entering the building. I remember because he looked up at the rain first, as though checking the weather."»
Collins blinked.
"That's oddly specific."
Arthur nodded.
"People remember habits better than faces."
He continued reading.
«"He walked with his hands behind his back."»
Arthur stopped.
His expression changed slightly.
"What?"
Collins asked.
Arthur closed the notebook.
"Nothing."
But it wasn't nothing.
Henry had often walked exactly the same way whenever he was thinking through a difficult case.
Arthur pushed the thought aside.
Coincidences were dangerous.
---
Across London...
Grace Whitlock carefully locked her front door.
She had ignored the anonymous warning yesterday.
Not completely.
She hadn't left the house.
But today...
Her daughter needed medicine.
She couldn't wait any longer.
"Mum?"
The little girl looked up.
"Are we going out?"
"Just for a few minutes."
Grace forced a smile.
"We'll be straight back."
She picked up her handbag.
Paused.
Then looked once more at the folded warning tucked inside her apron.
Do not leave your home until tomorrow morning.
Tomorrow.
She looked at the calendar.
Her heart skipped.
Today...
Was still today.
She quietly put her handbag back down.
"No."
Her daughter looked confused.
"I've changed my mind."
The little girl nodded without complaint.
Grace walked slowly to the window.
The black motorcar remained parked halfway down the street.
She had convinced herself yesterday that it belonged to a neighbour.
Now...
She wasn't so sure.
---
Evelyn followed Alexander through another narrow passage.
The air felt colder here.
Older.
The brickwork had changed.
Victorian construction gave way to rough-cut stone much older than the surrounding tunnels.
She finally spoke.
"Who built these?"
Alexander answered without looking back.
"Different people."
"When?"
"Over hundreds of years."
"You've been here before."
It wasn't a question.
He remained silent.
She smiled faintly.
"I'll take that as a yes."
A corner of his mouth lifted almost imperceptibly.
"You'll take many things as answers."
Before she could respond...
He stopped.
Completely.
His eyes settled on the floor.
Evelyn looked down.
A matchstick.
Freshly extinguished.
Still smelling faintly of sulphur.
Someone had been standing here less than a minute earlier.
Alexander's voice dropped.
"We're no longer ahead of them."
He looked toward the darkness beyond the tunnel bend.
"They're ahead of us."
---
At that same moment...
Miles away beneath another forgotten part of London...
A solitary figure sat inside an abandoned underground warehouse.
No lights.
No voices.
Only the rhythmic sound of an old machine quietly turning in the darkness.
Click.
Pause.
Click.
The figure looked up from the city map spread across the wooden table.
Several coloured pins marked different parts of London.
One rested over Scotland Yard.
Another over Evelyn's apartment.
A third over Grace Whitlock's street.
Slowly...
He reached toward the third pin.
Not to move it.
To straighten it.
His eyes lingered there for several long seconds.
Then he quietly folded the map closed.
For the first time since Henry Whitlock's death...
His gaze did not remain on Arthur Delbury.
Nor on Evelyn Ashcombe.
It remained fixed on Grace Whitlock.
As though he already knew...
That somewhere else in London...
Someone had finally made the move he had been expecting.
And if he was right...
The next twenty-four hours would decide whether Henry Whitlock's final sacrifice had been enough.