SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!
SPOILERS AHEAD
The Cellar Plot Summary and Synopsis
A woman must confront an ancient and powerful entity after her daughter mysteriously vanishes in the cellar of their new home.
Source: Wikipedia (CC BY-SA 3.0).