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When a group of teenagers explores sealed tunnels beneath the town of Redmoor, they unknowingly awaken an ancient intelligence buried deep underground, and those who return begin to change, becoming part of a coordinated system that uses human bodies as extensions of itself; as possession spreads rapidly and government quarantine collapses into chaos, Thomas Mercer, an adult who once discovered the tunnels and attempted to seal them years earlier, realizes the entity is not simply killing or reanimating people but learning through them, transforming the infected into a single evolving network that spreads beyond Redmoor and turns entire regions into controlled territory with no clear way to stop it.