The 4th Floor is a 1999 mystery thriller film written and directed by Josh Klausner in his directorial debut and starring Juliette Lewis, William Hurt, Shelley Duvall and Austin Pendleton.

The film follows Jane (Lewis) who has inherited a rent-controlled brownstone apartment from her late aunt, and, despite her boyfriend Greg's (Hurt) appeals, has decided to move in and live on her own for the first time.

The locksmith (Bell) is a strange man who lives in the building across from Jane, whom she suspected of harming a woman earlier.

After an argument with Greg about her refusal to move in with him, her tiles on her kitchen floor are smashed by her neighbor from downstairs and she calls the police.

However, things get worse as Jane's bathtub and apartment are infested with maggots and mice, and she calls an exterminator (Costanzo) to handle the problem.

After the exterminator reveals that the mice infestation was no accident and that most likely her neighbor had been putting them through a drilled hole in her floor, Jane becomes terrified.

There, she finds mice and rats in cages, a typewriter and the ceiling completely mapped out with her furniture, along with the word "Portcullis" written on a wall.

She opens the giant parcel to find it full of packing noodles, the same ones she found in the trash bags outside the neighbor's door, along with her sorry note saying "Truce accepted".