The narrative centers around Kaira and her friends, Ritika "Ritu", Aruna, and Kavya, who stumble upon an intriguing book titled Halloween Stories during a lively Halloween party hosted at Kaira's home. This unique book carries a cautionary note insisting that all chapters must be read without interruption, sparking a thrilling adventure as they plunge into its eerie tales. As they explore the haunting narratives, they unexpectedly encounter the very characters from the book in their reality, leading to an exhilarating exploration of the secrets held within the book and the experiences of the friends as they navigate this extraordinary situation.
Shifting focus, we meet Vasanthi, a journalist on the hunt for a new rental property. After a disheartening midnight agreement with a broker falls through, she quickly settles into a new place. Curiously, before she enters her rental, the landlady poses a rather odd question about whether Vasanthi experiences hiccups. Brushing it off, Vasanthi nonchalantly affirms that she does not. However, soon enough, she begins to experience peculiar hiccup episodes, which escalate into unsettling paranormal occurrences that ultimately lead to her demise before the landlady. Shortly thereafter, the landlady places a "to-let" sign on the property once more.
In another subplot, Malavika has just come back from a triumphant traditional date when she inadvertently causes the deaths of an old man and his grandson. Panic-stricken, she rushes home, only to realize that the spirits of the deceased are haunting her, culminating in her soul being ensnared within her own home.
Janaki "Jano", ecstatic over her friend's acceptance of her love proposal, suddenly feels an ominous presence as strange paranormal activities unfold around her. A chilling video appears on her phone, featuring a woman urgently asking for help to rescue herself and her boyfriend from a haunted house. As Jano attempts to share this troubling message with her boyfriend, she becomes aware that someone—perhaps something—has been observing her through her phone. Tragically, a mysterious ghost ultimately brings a fatal end to her life.
Meanwhile, Akash, a paranormal scientist, along with his girlfriend Meera, ventures to a haunted bungalow where he unveils a horrifying tale from 1961. The story recounts how a Zamindar appointed four bodyguards to protect his stunningly beautiful daughter, only for the guards to commit a heinous act when the Zamindar left town. Upon discovering the atrocity, he retaliates violently, severing their heads and leaving the town, thereby sealing the spirits of the girl and the bodyguards within the bungalow. Akash is eager to document proof of their existence, whereas Meera remains skeptical, agreeing to accompany him to demonstrate that ghosts are mere figments of imagination. Their exploration leads to inexplicable occurrences, culminating in the ghosts manifesting and tragically taking Meera's life before Akash.
Days later, burdened by grief, Akash, with encouragement from his mother, meets with Vasanthi and Malavika in hopes of a traditional arranged marriage. It soon becomes evident that Meera’s ghost, haunting Akash with possessive intentions, is eliminating the girls he encounters. In a twist of fate, after Akash finally agrees to Jano's proposal, she too becomes a victim of Meera's wrath.
As the book's climax unfolds, it is revealed that one of the four girls is destined to become Akash's bride, leading to a tense atmosphere as suspense grips the narrative. However, in a surprising twist, Kaira declares that it was all a prank, signaling the end of the party.
In a shocking turn of events, the following morning reveals that Kaira was unknowingly communicating with the spirits of her friends throughout the night, having passed away in an accident before arriving at her house. This revelation leaves her reeling. A few days later, while trying to find a match at her parents' behest, she recognizes Akash as the intended groom, showcasing her remarkable insight into his profession before he has a chance to speak. The film concludes with an astonished Akash questioning her uncanny knowledge.
