It is Halloween night. The clock strikes midnight, the house is unusually quiet, and a faint sound comes from the room next door. Perhaps it is the wind. Perhaps a window has been left open. Then comes another sound, followed by the unmistakable feeling that someone is watching you. You stare into the darkness, trying to convince yourself that there is nothing there.

But what if there is? And what if the explanation is far more disturbing than a ghost?

Halloween has always been about the things we fear: haunted houses, restless spirits, and creatures lurking in the shadows. We tell ourselves frightening stories because, somewhere beneath the fear, we enjoy the mystery. Yet, in the world of Humayun Ahmed’s Misir Ali, the real mystery begins when we stop believing everything we see.

A psychology professor with sharp eyes, thick glasses, an unassuming appearance, and an almost obsessive curiosity about the human mind, Misir Ali is an unlikely hero of horror. He does not carry weapons, hunt ghosts, or rely on supernatural powers. Instead, he listens. He observes. He asks questions that others would rather leave unanswered. When someone claims to have witnessed something impossible, he searches for a possible explanation before surrendering to the supernatural.

And that is precisely what makes him so fascinating. Misir Ali does not dismiss the unknown out of arrogance, nor does he accept it out of fear. He approaches every mystery as a problem of human behaviour, perception, and evidence. Yet, even when reason begins to illuminate the darkness, the uneasiness rarely disappears entirely.

In Debi, published in 1985, readers first encounter Misir Ali through the mysterious experiences of Ranu, a woman whose unusual abilities and disturbing encounters challenge conventional explanations. Is there something supernatural at work, or is the answer hidden within the complexities of the human mind? Misir Ali’s investigation draws readers into that uncomfortable space between belief and doubt. In Nishithini, the unsettling atmosphere deepens, while Brihonnola explores how a seemingly supernatural mystery can lead towards a disturbing human explanation. Works such as Nishad and Onnobhubon further demonstrate the range of mysteries surrounding this remarkable character.

But Misir Ali himself is not without mystery. Thin, somewhat dishevelled, and often lost in thought, he seems detached from the ordinary concerns of life. Beneath that quiet exterior, however, lies a mind relentlessly searching for patterns and explanations. He understands human behaviour with remarkable insight, yet he is not omniscient. His rationality does not guarantee certainty, and his investigations do not always produce answers that make the world feel safer.

Perhaps that is the defining difference between conventional horror and a Misir Ali story. A traditional ghost story asks us to fear what might be hiding in the darkness. Misir Ali asks us to examine the darkness itself. What if the shadow is not a ghost, but something we have misunderstood? What if the strange voice is a trick of perception? And what if the explanation reveals something deeply unsettling about the person standing beside us?

Humayun Ahmed understood that fear does not always need a monster. Sometimes, it emerges from a memory we cannot trust, a mind we cannot understand, or a truth we would rather not discover. His stories draw on familiar Bangladeshi beliefs about the supernatural but place them under the scrutiny of a man who refuses to accept appearances as answers. The result is a form of suspense in which the reader is constantly caught between wanting an explanation and fearing what that explanation might reveal.

This Halloween, perhaps the most interesting way to experience horror is not to watch a ghost emerge from behind a door, but to follow Misir Ali as he tries to establish whether there was ever a ghost there in the first place.

Pick up Debi or Brihonnola. Read late into the night. Let the questions accumulate. And when you finally close the book, listen carefully to the silence around you.

If you hear a sound from the next room, remember Misir Ali’s instinct to question before believing.

Then again, you might still want to turn on the lights.

After all, the most frightening mysteries are not always the ones we cannot explain. Sometimes, they are the ones we can.