Shut In (2015)

Shut In (also known as Intruders) is an American horror thriller film directed by Adam Schindler and written by T.J. Cimfel and David White. The film stars Beth Riesgraf, Rory Culkin, Martin Starr and Jack Kesy.

Anna suffers from severe agoraphobia and has not left her childhood home in ten years, since her father died. She takes care of her brother Conrad, who is dying of pancreatic cancer, and receives daily deliveries of food from Dan, whom she is friendly with. After Conrad dies, Dan arrives with another delivery of food, but Anna breaks down. Anna explains the situation, and they commiserate over how they both feel trapped in their current situations. Anna shows Dan a large sum of money and offers it to him as a chance to escape his circumstances, but he declines.

The day of Conrad's funeral, three men (Perry, and brothers Vance and J.P.) break into Anna's house looking for the money, expecting the house to be empty. When they discover her, they are surprised to find that she cannot leave the house, and also find that she will not reveal the location of the money. Perry decides that they cannot leave Anna alive. Meanwhile, Dan arrives, looking for Anna since she was not at her brother's funeral. The thieves restrain Dan and begin to search the house for the money. Anna escapes, kills Vance, and drags him into the basement. The other two thieves head into the basement to investigate, and Anna activates a switch which retracts the staircase.

Anna confronts Dan who admits that he told Vance about the money but never intended the robbery. Anna breaks two of his fingers, throws him into the basement and dislocates his knee in the fall. Using a surveillance system, Anna lures J.P. into a separate room and locks him in. Meanwhile, Perry finds a rock and breaks a lock in an attempt to escape. Anna sneaks into the basement and bludgeons him to death. Dan attempts to escape as well and finds a body in a freezer. Anna puts him in the same room as J.P.

As Anna watches J.P. and Dan, J.P. deduces the truth of their situation: Conrad was a serial killer who lured his victims into the basement and killed them while Anna watched. Anna confirms this but clarifies that all of their victims were child molesters, as was Anna and Conrad's father. Anna promises to release Dan if he kills J.P. and reveals a gun with a single bullet, but Dan refuses. When J.P. grabs the weapon and points it at Dan, Anna unlocks the door. J.P. and Dan escape. Suddenly, J.P. returns to the house and begins pouring gasoline everywhere, looking for revenge against Anna. They fight, he attempts to molest her and Anna kills him. After Dan leaves without saying a word, Anna walks outside, and throws a lighter down, setting her house ablaze.