"Hellraiser: Deader" opens in a gritty crack den, where a woman is seen capturing shocking events on camera, including a brutal murder. This woman, Amy, a newspaper reporter, creates a scandalous article titled "How to be a Crack Whore." Her boss presents her with a disturbing video featuring a cult known as the "Deaders." The footage reveals a harrowing ritual: a woman is brainwashed, murdered, and then resurrected. Although horrified, Amy's journalistic instincts compel her to chase the story to Romania, where the strange event occurred.
Upon her arrival, Amy gains access to a decrepit apartment by offering a bribe to the landlord. Inside, she discovers the hanged body of Marla, the woman from the video, clutching a mystical puzzle box. In a terrifying moment, Marla’s spirit comes alive and tries to assault her. After a narrow escape, Amy watches Marla’s video warning against opening the box. But curiosity triumphs, and when Amy pries it open, sinister chains emerge, piercing her head. Pinhead then appears, ominously cautioning her about the imminent danger she faces. However, Amy soon awakens, realizing it was merely a nightmare.
Later, she journeys to a seedy subway area where she encounters Joey, a dispassionate man in a drug den. When she shows him the puzzle box, he reveals the identity of the cult leader, Winter. After leaving, Amy catches a glimpse of Winter in the subway, but her attempts to confront him land her in police custody. Her boss bails her out, leading her on another investigation to an abandoned building. As she descends into an underground labyrinth, she becomes ensnared and stabbed by an unseen figure. This too turns out to be an illusion.
Next, Amy faces another jarring experience in her hotel room, reliving traumatic memories from her childhood, only to be abruptly awakened by a knife plunging into her back. Despite the agonizing pain, she manages to extract the blade, desperate to stop the bleeding. Pinhead appears once more, proclaiming that her soul now belongs to him and revealing that the Deaders need her as a gateway into their realm.
Desperate for assistance, she returns to the train station to find Joey, but he disappears. Captured and placed in an asylum, she encounters the spirit of Marla, who confesses her role in the stabbing. During her confinement, Amy's boss visits but leaves her alone once again. Marla informs her that the Deaders require Amy to unlock the puzzle box, as only she holds the key. As reality blurs, she escapes the asylum just as her wound reopens, recalling the traumatic moment she killed her father in self-defense after being assaulted by him.
Finally, Amy finds herself at the hideout of the Deaders, where Winter presents her with a knife, urging her to stab herself to join their ranks. Defiantly, she hurls the puzzle box, triggering its ominous opening and summoning the Cenobites. In a fierce confrontation, Pinhead brutally destroys Winter and the remaining Deaders. He then advances towards Amy, ready to claim her for hell due to her actions. In a desperate act, she stabs herself, ensuring her demise allows the Cenobites to escape through the portal.
The conclusion leaves a chilling ambiguity, as a news report states that no trace of Amy's body was found. Her boss, driven by the eerie events, seeks another journalist to delve into the mystery of the Deaders, hinting at their lingering presence.
