In a modern high-rise apartment complex, the residents are gathered for an evening of relaxation and entertainment. A young woman, Sally, is alone in her apartment celebrating her birthday, with her friends excitedly waiting in another room. As she watches a horror movie on television about demons rising and wreaking havoc, strange occurrences begin to unfold. The demonic forces from the film somehow breach the screen and enter the real world, infecting Sally. As she transforms into a monstrous demon, she spreads the terrifying condition to others, causing chaos and fear to grip the building.

The contagion spreads rapidly, turning the once-peaceful residential tower into a battleground between humans and relentless demonic creatures. Residents are forced to fight for their lives, barricading themselves in their apartments and attempting to escape the growing swarm. The compounding terror threatens to consume everyone as the surviving residents must band together against their supernatural foes. The apartment complex becomes a labyrinth of horror as they navigate through bloodthirsty demons and their own mounting fears. Each floor hosts new dangers as they struggle to find safety and hope for survival amidst the nightmare surrounding them.