While patrolling around town, Officer Daniel Carterstumbles upon a local drug addict, James, who stumbles and is injured on a deserted woodland road. Daniel decided to take the bloodstained, delirious James to a local hospital for treatment. The hospital, although nominally still open, is being relocated after the fire, and only four skeleton medical staff are currently operating. There, Daniel reunites with his ex-wife, Alison Fraser, a nurse at the hospital who became estranged after the death of their child. Alison's mentor, Dr. Richard Powellhas deep sympathy for both of them, as he mourns the recent death of his youngest daughter from an incurable disease.
In a hospital waiting room, a pregnant teenage Maggieand her kind grandfather Ben, the only remaining patient in bed, are led by a sharp but inexperienced intern, Kim.care of it. A stubborn old state, Mitchellarrives and insists on taking over the proceedings. However, when Daniel tried to leave the hospital, he encountered a group of white-robed, knife-wielding cultists wearing black triangle-painted hoods who silently gathered around the building and forced Daniel to return to the hospital.
Before Daniel can discover the purpose of the terror crowd surrounding the hospital or explain the situation to StateMitchell, vigilantes Vincentand Simonin and threaten everyone with shotguns. , they announced they were going to shoot James, which they insisted was non-negotiable. Meanwhile, an experienced nurse inexplicably begins a violent act, brutally killing a patient in her hospital bed. When Daniel shot her, her corpse began to deform messily into a terrifying, tentacled creature. As the death toll mounts, and all the corpses are terribly mutated, to protect the survivors, Daniel leads them into the depths of the hospital, where they discover the gateway to a great evil
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