On a quiet autumn day, the narrator traverses a desolate land. He heads towards the "House of Usher," a mansion that evokes deep sadness within him. He reaches the dwelling where Roderick Usher, his old friend, awaits him. Roderick, seriously ill, has invited his friend in hopes of alleviating his own suffering.

Despite their long-standing friendship, the man realizes he knows little about Roderick. During his stay, he uncovers the dual hereditary nature of the Ushers: immense artistic talent and profound melancholy. Moreover, Roderick is particularly sensitive and plagued by an indefinable terror.

Madeline, afflicted by a mysterious illness, briefly appears only to vanish into the shadows. Her fleeting presence leaves a spectral impression on the man. He also notices a deep connection between her and Roderick, which reinforces the mystery enveloping the house.

Roderick Usher confides to the narrator a startling piece of news: his sister Madeline is dead, or at least appears so due to her catatonic state. This event compels Roderick to wish to preserve Madeline's body in a sarcophagus within the house's crypt, preventing scientists from dissecting it.

The narrator, though disturbed, assists Roderick in transporting Madeline's body to the crypt, a dark and oppressive place. As they place the body in the sarcophagus, a disquieting resemblance between the Usher siblings reveals itself, suggesting a profound and unfathomable bond.

After the burial, Roderick begins to show increasing agitation. It's as if an invisible terror haunts him. The narrator watches these changes with concern, feeling the house's atmosphere become ever more tense and filled with omens.

Strange and inexplicable noises begin to pervade the dwelling, fueling the growing anxiety in the narrator's heart. He struggles to find a rational explanation. But the dark bond between Madeline and Roderick seems to echo through the empty corridors. Something supernatural is at play.

The nights turn into a nightmare for both. Roderick roams the house in mental disarray. The narrator lies awake, listening to every slight sound. Each creak and whisper heightens the sensation that Madeline's death has unleashed dark and incomprehensible forces.

In this atmosphere of escalating horror, the bond between the Usher siblings emerges as a profound mystery, an enigma intertwined with the very essence of the house. The tension peaks, setting the stage for a revelation as terrible as it is inevitable.

The man, attempting to comfort Roderick, immerses himself in an atmosphere of growing unease, influenced by Roderick's bizarre behaviors and fears of a malevolent influence of the mansion on his family. Together, they delve into works of dark themes, culminating in Roderick's decision not to immediately bury Madeline—a decision inspired by arcane beliefs and the uniqueness of her illness.

The man assists Usher in setting up the temporary tomb for Madeline, located in a dark and damp crypt beneath his bedroom, previously used for sinister purposes and now lined with copper due to its past use as a gunpowder store. During the placement of the body, they notice a strong resemblance between brother and sister, revealing they were twins with a deep and incomprehensible bond.

Usher becomes progressively more agitated, drifting away from his daily routines and exhibiting intense signs of terror. Usher's unease also transmits to the narrator, who feels enveloped by the same aura of superstition and fear.

Unable to sleep due to an oppressive sense of terror, he is disturbed by noises reminiscent of a book he was reading until Usher, in a state of contained hysteria, interrupts him to share his unease.

In a state of panic, Usher confesses to having perceived movements of Madeline in the sarcophagus, fearing he had buried her alive; suddenly, the door bursts open, revealing a bleeding and dying Madeline who lunges at him, leading to his death. Faced with this scene, the narrator flees the house, which collapses, swallowed by the lake beneath the fury of the storm.