Amid the early stages of a mysterious virus outbreak, a group of survivors finds itself stranded in a city reduced to rubble by a sudden cataclysm. Pursued by relentless infected threats, they take shelter inside a sprawling shopping mall that has largely escaped the destruction. Yet within its corridors, an oppressive atmosphere of dread takes hold as madness and danger close in from all sides. Their desperate bid for safety becomes a tense struggle against both external perils and mounting despair.