Aisha and her husband, Guillermo, arrive at their friends' house for Christmas dinner and are soon trapped by a fierce snowstorm. A shadowy figure emerges, violently attacking and dragging one of their friends away.

As the night unfolds, the group fights for survival as relentless shadowy intruders return to pick them off one by one. When Guillermo falls ill, Aisha fights through the storm to get help from the only person still with power on in the neighborhood: Old Lady Gianna.

There, Aisha discovers she must work across two dimensions to unravel the mystery and save Guillermo.