THE INVISIBLE ASSASSIN -EASHIN IBN FIROZ

It was three in the morning. The streets of Gulshan-2 were almost empty. Occasionally, the distant barking of stray dogs echoed through the silent night. Most of the lights in the tall apartment buildings had already gone out. The neighbours had called the police after they noticed a strange smell. Detective Inspector Nafisa Karim forced the door open and stepped inside the apartment. In the middle of the room sat Minister Azmal Hossain Chowdhury, one of the most powerful members of the cabinet. He was seated calmly in a chair. His eyes were open. An eerie smile rested on his face. But he was not breathing.

The cause of death was unknown. No wounds. No trace of poison. No signs of a heart attack. Yet the man was dead. It was almost as if he had died from fear.

Nafisa felt an unnatural chill inside the room. An unsettling silence hung in the air, as though something terrible had happened here, leaving behind no evidence. Her assistant, Constable Rahul, pointed toward an envelope lying on the table. Written on the front were the words:

“This is the first. Many more remain.”

Nafisa had joined this department only six months ago. Before that, she worked in the Cyber Crime Unit. She had been transferred here for reasons that were never clearly explained. Her superior, ADC Rashed Faruq, entered the room and spoke in a low voice. “Nafisa, this case must not go public. There’s pressure from above.” Nafisa looked straight into his eyes. “Sir, can we hide a dead body?”

Rashed Faruq said nothing. He quietly left the room.

The next morning Nafisa arrived at her office and noticed an old file placed neatly on her desk. As she opened it, her heart skipped a beat. Twenty-five years earlier, four people had died in exactly the same way. Uninjured bodies. The same strange smile. The same mysterious letters.

Detective Inspector Anwar Karim led the investigation.

The file recorded that he disappeared during the case. Anwar Karim was Nafisa’s father. Memories rushed back from her childhood. Her father used to say, “If you want to find the truth, you must fear your friend.” Nafisa’s hands trembled.

She had never known this part of the story. Her mother always said only one thing:

“Your father was not a coward”—on the final page of the file, there was a handwritten note from Anwar Karim. “Such an act was not done by a man. But it was carried out through men. Anyone who discovers the truth will never return if they fear it.”

Nafisa began investigating the minister’s final twenty-four hours. She discovered that on the night before his death, he had visited an old mansion in Old Dhaka.
The place was known as Neel Kuthi, the Indigo House.

According to a confidential source, a secret meeting had taken place there.

The organisation’s name was “The Fourth Pillar”. Official police records contained no trace of such an organisation. No files, no reports. Nothing. Rahul searched the internet and shook his head. “Madam, there’s no information at all. Not a single reference. It’s like they don’t exist.” But Nafisa knew something important:

Anything capable of hiding itself so perfectly must be extremely powerful.

That night her phone vibrated. An unknown number had sent a message.

“Do not repeat your father’s mistake. Walk away.” Nafisa typed back calmly.

“I’m not going anywhere.” Ten seconds later a reply appeared. “We knew you would say that.” The second body was found beside the Parliament complex.

This time the victim was Karimul Islam, a senior journalist known for exposing corruption. The scene was identical.

An unharmed body. A faint smile.

Another letter. But this time there was something else inside the envelope: a photograph. It showed Nafisa standing in front of Neel Kuthi. Someone had been following her. Nafisa visited forensic specialist Dr Tanvir. “Look at this,” he said, pointing to two brain scans. Both victims had shown abnormal electrical waves in their brains just seconds before death.

It looked as though someone had been influencing their minds externally. “Is that even possible?” Nafisa asked. Tanvir remained silent for a moment. “Science says no,” he finally replied. “But the evidence says otherwise.” That evening Nafisa went to Neel Kuthi. She asked Rahul to stay outside. The mansion was nearly two hundred years old, dating back to the British colonial period. The corridors were dark. Old portraits hung silently on the walls. Inside she discovered something unexpected: an old diary. On the first page were the words: Anwar Karim, 1997. Her father’s diary. As she read, the truth slowly unfolded. The Fourth Pillar was a secret political organization that controlled the highest levels of power in the country.

But their real weapon was not politics.

They weaponised fear. By employing a combination of psychological manipulation, drugs, and experimental technology, they were able to amplify a person’s fear to such an extreme level that it caused the heart to stop.The reasons for her transfer here remained unclear.

Anyone who opposed them either died… or went insane. In the final pages Anwar Karim had written, “I know who they are.

I may not live much longer. But if someone reads this diary, remember, fear is their greatest weapon. Without fear, they are powerless.

Nafisa, if you ever find this diary, know that your father loves you.” Tears blurred Nafisa’s vision. For a moment it felt as if her father were speaking directly to her.

She pressed the diary against her chest.

Suddenly, footsteps echoed behind her.

She turned. ADC Rashed Faruq stood in the doorway, accompanied by two men.

“Your father came here just like this,” Rashed said calmly. “You are his daughter after all.” Nafisa felt something wrong.

Her head became heavy. Her chest tightened. Breathing grew difficult.

Something had been used on her, perhaps in the air or on the door handle. Fear surged through her mind like waves. Memories flooded in. Her father’s disappearance. Her mother’s bitterness.

Her failures. Her heart raced uncontrollably. Everything seemed to fade.

Then her father’s words echoed in her mind: “If you don’t fear them, they can do nothing.” Nafisa closed her eyes.

She took a slow breath. She decided that she would not be afraid. The fog in her mind began to clear. Rashed stared in disbelief as Nafisa stood upright again. “This method only works if the victim feels fear,” Nafisa said quietly. “I fear no one except Allah.” At that moment a loud metallic crash came from outside. The door burst open. Rahul’s voice shouted, “Police! Nobody moves!” Rahul had brought the entire team. From the beginning, Nafisa had kept her phone recording. Rashed Faruq and seven members of the Fourth Pillar were arrested.

The investigation revealed the existence of a secret laboratory producing neurochemical weapons designed to intensify human fear hundreds of times.

The technology had been imported from abroad. For twenty-five years it had been used to control political power. During a press conference, a reporter asked Nafisa,

“How did you survive when everyone else died?” Nafisa smiled slightly. “My father taught me.” That night Nafisa visited the cemetery. Her father had no grave. His body was never found. But her mother had placed a memorial stone with his name.

Nafisa rested her hand on it and stood silently for a long time. For the first time in years, she felt that she had completed her father’s unfinished battle. A gentle wind moved through the darkness. She whispered softly, “You were never a coward, Father. You were only alone.”