The Waiting Room (2019)

Four individuals awaken in a locked cell with no recollection of who they are and how they got there. They start to blame each after their emotions start to run away with them when their attempts of escape fail. After a woman mysteriously appears in the room they suspect that their is a way out after all. But after one of them is taken away in a horrific fashion, the remaining prisoners must act quick to figure out where they are and how to escape as they realize that the real threat may be in the cell with them and not on the other side of a locked door.