A woman goes to the countryside to spend a quiet weekend after losing her job and having her last complicated relationship implode. She rents a country house from an old-fashioned widower, who struggles to hide his psychopathic tendencies.
After losing her job and imploding her latest dysfunctional relationship, Olive (Amanda Crew) flees the city for the weekend, escaping to the countryside for some peace and self-reflection. She rents an ornate country house from an eccentric widower named Harvey (Robert Patrick). Soon two generations collide with terrifying results as Olive awakens Harvey's homicidal tendencies and is plunged into a blood-soaked fight for her life. More than your average slasher film, TONE-DEAF provides a dark critique of the bizarre cultural and political climate that currently exists.
As a little girl, Olive Smith performs a piano recital. Olive's parents miss the performance when her depressed father Michael hangs himself following an argument with Olive's mother Crystal.
As an adult, Olive breaks up with her difficult boyfriend York. Olive's friends Lenore and Blaire console Olive after her sexist boss Asher fires her too. Olive plays a keyboard for her friends, who tell her she is great even though she is tone deaf.
Olive sees a frightening vision of her father in front of the urn holding his ashes. Olive calls her mother Crystal, who lives in a hippie commune, about the incident. Crystal mentions that Michael wanted his ashes scattered into space. Crystal also recommends that her daughter clear her head by getting away for the weekend.
Olive has another haunting vision of her dead father when York comes by with his new girlfriend to pick up his things.
Through Airbnb, widower Harvey Parker rents his remote house to Olive for the weekend. Harvey rants to himself about millennials while mourning at his wife Edith's homemade grave.
Olive meets Harvey's family friend Agnes, who later asks Harvey why he is renting out his house. Harvey takes Agnes captive by tying her to a bed in his cabin down the road.
Olive plays Harvey's piano for her mother over the phone. Harvey sees a vision of his dead wife slitting her throat with a letter opener at the piano while secretly watching Olive play.
Harvey tells Agnes that his estranged son David thinks Harvey suffers from dementia and wants to put him in a home. Harvey reveals that he wants to know what it feels like to kill someone, which is why he set up Olive in his house. Harvey regrets that he has to kill Agnes too because she interfered.
Harvey is unable to kill Olive while she sleeps. Harvey hears Edith's voice telling him to stop. Harvey puts a spider in Olive's contact lens case.
Fellow commune member Uriah professes his attraction to Crystal. Crystal allows Uriah to go down on her while she texts Olive.
Harvey returns to Agnes. Agnes angers Harvey by claiming he trapped his wife in their marriage by lording custody of their son over Edith. Harvey suddenly stabs Agnes to death.
Unaware that Olive rented the house, David comes by to pick up his prototypes for a Shark Tank pitch. Startled by his unannounced appearance, Olive compels David to leave.
Harvey follows Olive to The Cowboy Palace Saloon where she meets her Tinder date James. A news bulletin on TV reports on a missing woman. Harvey sees James secretly drug Olive's rum and Coke, but Olive doesn't drink it. Olive instead invites James to join her at the house for dinner later.
Harvey follows James back to his nearby motel room. Harvey murders James with a hammer. Harvey finds a captive woman in James' closet and kills her too.
Olive buys LSD from the attendant at a makeshift car wash. While tripping back at the house, Olive sees visions of various ex-boyfriends before her father finally appears to her. Michael talks about Crystal and his depression before urging his daughter to choose better boyfriends and get rid of his ashes. Michael adds that Olive is great at playing piano.
York calls to tell Olive that he made a mistake and wants her back. Olive hangs up on him.
Harvey murders a homeless man on his way to the house. Harvey cuts the house's power, crushes Olive's glasses, and lays boards spiked with nails on the staircase.
Harvey wakes Olivia by loudly playing the radio. Frightened, Olive texts her mother for help before her phone goes dead.
Seeing an opportunity to make things right with Olive, Crystal drives to the house with Uriah. Their car gets a flat tire on the way, but David stops to help them fix it.
Olive arms herself with the letter opener Edith used to commit suicide. The spider bites Olive when she tries putting in her contacts. Harvey calls Olive downstairs. Unable to see, Olive steps on one of the nails. Olive stabs Harvey with the letter opener when he attacks. Olive tries to hide, but Harvey crushes her foot and knocks her unconscious.
Olive recovers to find that Harvey dressed her in Edith's clothes and seated her at the piano. Harvey forces Olive to play like his wife used to do. Harvey hears Edith's voice and sees a vision of Edith as a ghoul. Harvey smashes the piano with a tomahawk when he realizes Olive is tone deaf, which Olive never knew.
Crystal and Uriah arrive at the house. Harvey kills Uriah. Crystal shoots Harvey to the ground, although she accidentally shoots her daughter too. Olive kills Harvey by stabbing him with the letter opener.
Crystal tells Olive that she is terrible at playing piano and now realizes it was wrong to falsely encourage her. Olive curses baby boomers and calls 911 for an ambulance. David later surveys the crime scene with his boyfriend.
Olive and Crystal try scattering Michael's ashes using a toy rocket that falls limply to the ground. The women walk away confident that Michael would have appreciated the effort anyway.
