Three strangers find themselves alone, while everyone else has vanished, following a mysterious storm. Conner Hayden is a lawyer who abandoned his family, Helen Krause is an aging model, and Mitch Kent is a man with a troubled past. Together, the three face the terror of realizing they are being watched by sinister and shadowy "observers" who are forcing them to see visions of their own pasts. As the observers become more aggressive, the trio flees...