Detectives Sean and David Carter, along with their colleague Christine Egerton, are investigating a series of gruesome murders committed by a serial killer known as The Preceptor. The investigation leads them into the dark world of the Cenobites and their demonic dimension when they discover a mysterious puzzle box associated with the murders. As they delve deeper, they encounter terrifying forces beyond human comprehension, manifesting through grotesque rituals that test their mental and moral boundaries.

As the case unfolds, Sean becomes increasingly obsessed, driven by his desire to catch The Preceptor and solve the mystery behind the puzzle box. This obsession takes a toll on his relationships and sanity, exposing him to darker and more dangerous realms. The detectives must confront their deepest fears and past traumas while navigating through layers of deceit and horror. Their pursuit of truth brings them closer to the realms where human suffering is exploited by sinister forces, leaving them to confront unimaginable horrors that challenge their very existence.