Following the horrific events at her family home, young Kirsty Cotton finds herself confined to Channard Institute, a psychiatric hospital run by the eccentric and deeply obsessed Dr. Phillip Channard. Unlike traditional psychiatrists, Channard is secretly fascinated by the occult, specifically the Lament Configuration and the theology of the Labyrinth, a
subterranean dimension ruled by Leviathan, the God of Suffering. Channard’s obsessive desire to cross the threshold into hell drives the narrative forward. Meanwhile, Kirsty is haunted by visions of her deceased father trapped in the underworld and desperately tries to warn the medical staff about the dangers of the puzzle box.Dr. Channard’s morbid curiosity leads him to employ a cynical patient, Kyle MacRae, to help uncover the truth. Soon, Channard acquires the blood-soaked mattress upon which Julia Cotton met her gruesome end in the previous ordeal. Utilizing a suicidal patient as a gruesome sacrifice, Channard resurrects Julia, whose skinless, muscle-bound corpse hungers for more human victims to fully regenerate. Julia easily manipulates the corrupt doctor, seducing him into believing they can conquer death together. Channard soon offers himself to Leviathan, but rather than being destroyed, he is transformed into a terrifying, cyborg-like Cenobite possessed by a sadistic desire to inflict pain.Concurrently, Kirsty discovers a drawing made by a mute, autistic teenage patient named Tiffany, who is remarkably gifted at solving puzzles. Channard exploits Tiffany’s unique talents, forcing her to solve the Lament Configuration to open the gateway to hell. Desperate to save her father and stop Channard, Kirsty enters the labyrinthine dimensions of hell, accompanied by Kyle. Inside this surreal, nightmarish realm of shifting corridors and infinite torment, they navigate various
psychological and physical horrors. Kirsty eventually encounters her father, only to realize in a devastating twist that the spirit is actually a trick orchestrated by the evil forces, or that her father has already been claimed beyond salvation.As the chaos reaches its peak, Kirsty confronts both the resurrected Julia and the monstrously upgraded Dr. Channard. Kirsty uses a clever deception, showing Julia a photograph of Frank Cotton to remind her of her past betrayal and fatal greed. A furious Julia turns on Channard, but the sadistic doctor easily overpowers and kills her, draining her remaining life essence. Realizing that Tiffany is the key to closing the gate, Kirsty manages to free the terrified girl. Working together, Kirsty tricks Channard into absorbing Leviathan's deadly energy beams, destroying the demonic doctor from within. Kirsty and Tiffany successfully escape the collapsing labyrinth, returning safely to the mortal world as the puzzle box seals itself once more.