Plot

The Maguire family is forced to take sudden refuge from a deadly tornado in a seemingly-abandoned storm cellar.

Alice Maguire and her three daughters are trying to get to the airport to pick up her husband/their father. But on the way there a tornado warning sounds and the trip gets too dangerous, so they stop on the highway and run to a house to take shelter. Nobody answers the door, so they all break into the cellar to wait out the storm. But then they discover that somebody is actually in the house above them, and then they get trapped in the cellar. There is much more to worry about than the impending storm, and their lives become endangered by something abnormal.—Michael Hallows Eve

Forced to take refuge from a deadly tornado, the Maguire family finds shelter in an abandoned storm cellar. As the storm passes, the family tries to make their way out--only to realize that someone, or something not quite human, is holding them captive. Struggling to get out alive, they soon find out that they aren't alone.—Lionsgate Marketing

A mother and three daughters get caught up in a tornado and take shelter in a storm cellar. While trapped inside the cellar, they quickly discover that they are not alone.