The hidden passage smelled of damp stone and decay.
A cold wind drifted upward from the darkness beyond the bookshelf, carrying with it the scent of wet earth, mold, and something older—something forgotten by time itself. Dust swirled through the narrow beam of Martin's lantern as Jones pushed the heavy wooden shelf aside with surprising strength for a man of his age.
Behind it lay a narrow stone staircase descending beneath the mansion.
Karn looked horrified.
"I never knew this existed."
His voice echoed faintly down the staircase.
Jones adjusted his spectacles calmly. "Old zamindar houses often contain escape routes," he said. "Especially families involved in political conspiracies."
Rudra Babu remained silent near the entrance. In the dim light, his lined face looked strangely haunted. Madhurima had once mentioned that parts of the mansion were older than British rule itself. Looking at the hidden passage now, Karn finally believed it.
Martin lifted the lantern higher. "Cheerful place."
No one replied.
The group descended carefully.
The stone steps were uneven and slick with moisture. Centuries of neglect had worn shallow depressions into the center of each stair. Somewhere below, water dripped steadily in the darkness with maddening rhythm.
Drip.
Drip.
Drip.
Karn gripped the wall for balance. The stone felt icy cold beneath his fingers.
As they descended deeper underground, the air became heavier. The silence of the mansion above disappeared completely, replaced by the suffocating stillness of buried spaces untouched by sunlight.
Martin walked beside Jones, keeping one hand near his coat pocket where he carried a revolver. The events of the previous night still weighed heavily on him. Niladri dead from cyanide poisoning. Haripada murdered. A hidden code inside a fountain pen. And now this underground labyrinth beneath the Roy mansion.
Nothing about the case felt ordinary anymore.
The underground corridor stretched deep beneath the estate.
Spider webs covered the walls in thick gray curtains. Water dripped steadily from cracked ceilings. In several places, roots from ancient trees had forced their way through the stonework like skeletal fingers clawing into the passage.
Karn swallowed nervously. "How old is this place?"
"Difficult to say," Jones replied quietly. "Perhaps late eighteenth century. Possibly older."
Their footsteps echoed endlessly ahead of them.
After several minutes, the corridor widened unexpectedly into a circular chamber supported by thick stone pillars. Martin raised the lantern slowly.
Inside stood an old iron trunk.
Broken open.
Empty.
The lid hung crookedly from rusted hinges. Deep scratches marked the metal surface as if someone had forced it open in desperate haste.
Karn moved closer. "This is where the bonds were hidden?"
Jones nodded thoughtfully but said nothing.
Martin crouched beside the trunk and examined the broken lock. "Recently damaged," he muttered. "Not more than a few days ago."
Then a faint sound emerged from the darkness behind them.
A movement.
Soft.
Careful.
Not alone.
A figure emerged suddenly from the shadows.
Martin spun around instantly, lantern raised high.
Karn gasped.
"Didi?"
Madhurima stepped into the light slowly.
She looked pale and exhausted. Her hair was disheveled, and dark circles shadowed her eyes as though she had not slept in days. Her saree was stained with dust from the underground passage.
For a long moment nobody spoke.
Then Jones broke the silence.
"Please do."
Tears filled her eyes almost immediately.
"I discovered the passage years ago," she whispered. "By accident. One of the shelves in the library moved when I was cleaning."
Karn stared at her in disbelief. "You knew about this place all this time?"
"Yes."
"Why didn't you tell anyone?"
Madhurima lowered her gaze. "Because Niladri found documents suggesting hidden wealth beneath the mansion. He became obsessed with it."
Jones folded his arms calmly. "The bonds."
She nodded.
"He believed the pen contained the key."
"And did it?" Jones asked.
"Yes."
Her trembling hand pointed toward the empty trunk.
"The bonds were hidden here."
Martin glanced inside the rusted chest again. "Where are they now?"
Madhurima hesitated.
"Gone."
Jones watched her carefully through the flickering lantern light. His expression remained unreadable.
"You did not take them."
It was not a question.
"No."
"Then who did?"
Before she could answer, footsteps echoed behind them.
Slow.
Deliberate.
Everyone turned sharply toward the staircase entrance.
A figure appeared at the top of the stone steps.
Holding a pistol.
Martin cursed under his breath.
Anirban descended calmly into the chamber, the gun steady in his hand. His face looked thinner than before, almost feverish. But his eyes burned with something dangerous—desperation mixed with rage.
Then he laughed bitterly.
"So the great Professor Jones finally solved it."
Karn looked stunned.
"You?"
"Yes, me."
His voice trembled violently despite the mocking smile on his face.
"Do you know what it feels like to drown in debt while living inside a crumbling palace full of stories about lost wealth?"
Madhurima stared at her husband as though seeing him for the first time.
"You killed Niladri?"
Anirban lowered his eyes briefly.
"He discovered the poison mechanism inside the pen before I did. He tried to blackmail me."
The chamber seemed to grow colder.
Martin stepped slightly sideways, subtly positioning himself closer to Jones.
"And Haripada?" he asked sharply.
Anirban gave a humorless smile.
"He saw me entering the study that night."
Karn looked physically sick.
"You murdered them over money?"
Anirban laughed again, louder this time. The sound echoed wildly through the underground chamber.
"Money? This family worships dead ancestors while everything rots around them!"
His voice cracked with years of bitterness.
"You all pretend nobility still matters. These halls are falling apart. The land is gone. The servants barely stay paid. Yet everyone clings to stories of honor while bankruptcy waits outside the gates."
Madhurima whispered, "You should have told me."
"And said what?" Anirban snapped. "That creditors were threatening prison? That I forged signatures to delay repayments? That every month I prayed for some miracle hidden inside this cursed house?"
Silence followed.
Jones stepped slightly forward.
"The cyanide mechanism was ingenious," he said quietly. "A tiny glass capsule hidden inside the pen barrel. Opening it incorrectly released the gas."
Anirban's lips curved faintly.
"The British designed it originally. For secret agents. The pen became a perfect guardian for the code."
Martin frowned. "Where did you learn that?"
"Niladri's research papers." Anirban looked toward the empty trunk. "He was smarter than all of you. He almost solved everything before I did."
Jones nodded thoughtfully.
"But you made one mistake."
Anirban's eyes narrowed.
"You assumed fear would protect you."
The pistol tightened in his hand.
"I still have the bonds."
"No," Jones replied quietly.
"You do not."
Anirban froze.
For the first time since entering the chamber, uncertainty flickered across his face.
Jones pointed toward the trunk.
"The bonds were removed long ago."
"What?"
"Your father-in-law discovered them years earlier."
Every head turned slowly toward Rudra Babu.
The old man stood near the chamber entrance, leaning heavily against the damp wall. In the lantern light, he suddenly appeared much older than before.
He sighed deeply.
"I used the money secretly after Partition," he admitted.
The confession hung heavily in the underground silence.
"To help refugee families settle in Cooch Behar."
Anirban stared at him blankly.
"You're lying."
"I am not."
Rudra Babu's voice trembled.
"Our family once prospered while countless others suffered. I could not keep wealth stained by colonial corruption."
Martin watched him carefully. There was no deception in the old man's face now—only exhaustion.
Rudra Babu continued slowly.
"In 1948 thousands arrived with nothing. No homes. No food. Children sleeping beside railway tracks. I sold the bonds through intermediaries over several years."
Karn looked stunned. "You never told anyone?"
"I was ashamed."
"Ashamed?" Anirban shouted.
"Yes."
The old man's eyes glistened faintly.
"Because the money should never have existed in the first place."
The underground chamber fell silent again except for the distant dripping of water.
Anirban's expression slowly twisted into disbelief.
Then despair.
"All this…" he whispered.
His voice broke.
"All this for nothing?"
Madhurima took a hesitant step toward him. "Anirban…"
But something inside him had already collapsed.
Years of greed, fear, resentment, and desperation suddenly stood exposed as meaningless.
His hand began to shake violently.
Then suddenly he raised the pistol.
Martin reacted instantly.
He lunged forward just as Anirban pulled the trigger.
The gun fired.
The explosion deafened the chamber.
The bullet struck the stone wall beside Jones, sending fragments of rock spraying through the air.
Jones grabbed Anirban's arm with surprising speed while Martin tackled him sideways. The lantern crashed to the ground, swinging wildly and throwing monstrous shadows across the walls.
Karn jumped forward instinctively.
The pistol discharged again harmlessly into the ceiling.
Dust rained downward.
"Take the gun!" Martin shouted.
Karn seized Anirban's wrist with both hands. The weapon slipped free at last and skidded across the floor into the darkness.
Anirban struggled briefly.
Then stopped.
All strength seemed to leave his body at once.
Within moments, it was over.
He collapsed onto the cold stone floor, breathing heavily, staring blankly into nothing.
Madhurima covered her face and began to cry silently.
Martin picked up the fallen lantern and steadied the flame. The chamber slowly returned to stillness.
Karn leaned against a pillar, shaken and pale.
Jones adjusted his coat calmly, though his sleeve had been torn during the struggle.
Rudra Babu looked at Anirban with profound sadness.
"You should have come to me," the old man whispered.
Anirban laughed weakly from the floor.
"And say what? That I murdered for ghosts?"
Nobody answered.
Somewhere above them, thunder rumbled faintly across the night sky beyond the mansion.
Martin exhaled slowly. "Well," he muttered, "that was unpleasant."
But Jones was not smiling.
His eyes had drifted toward the old fountain pen still resting inside his coat pocket.
The deadly instrument that had guarded the secret for decades.
Something about it still troubled him deeply.
Because one mystery still remained.
If Rudra Babu had already removed the bonds years ago…
Why had he kept the deadly pen all this time?