To escape a
stalker, Sawyer Valentini moves away from her
Boston home. Still paranoid and traumatized, she talks with a counselor at Highland Creek Behavioral Center, who tricks her into signing a consent form for voluntary 24-hour admission to a locked psychiatric hospital. Sawyer calls the police, who can do nothing due to the signed form. During the night, stress causes Sawyer to lash out at a patient and a staff member. Consequently, the staff psychiatrist retains her for seven more days. Another patient, Nate Hoffman, reveals to Sawyer that Highland Creek is running a scheme to exploit health insurance claims. They
trick people into voluntarily committing themselves as long as the patients' insurance companies continue to pay; when insurance claims run out, the patient is "cured" and released. One day, Sawyer sees David Strine, her stalker, working as an orderly under the
pseudonym George Shaw. Borrowing Nate's secret cellphone, Sawyer calls her mother Angela. David gives Sawyer a large dose of
methylphenidate, causing her to appear insane. That evening, when Angela arrives to attempt to get Sawyer out, David approaches her posing as a hotel employee, and kills her. David tortures Nate then kills him with an overdose of
fentanyl. Sawyer finds Nate's phone under her pillow, with images of Nate badly beaten. She alerts the staff, who dismiss and put her in
solitary confinement. David visits Sawyer and says he has a secluded mountain cabin he wants to take Sawyer to. Sawyer mocks him for his inexperience with women. David later returns and reveals he faked that Sawyer's insurance ran out, changing her status to released. In a forest, the body of the real George Shaw is found. To buy time, Sawyer feigns concern that David is a virgin, and that she does not want to be his first. She convinces David to have sex with another woman and suggests Violet, who previously threatened Sawyer with a
shank, and he brings her to the solitary confinement cell. Sawyer uses Violet's shank to stab David in the neck and flees as he kills Violet. He recaptures Sawyer outside, and she wakes up in the trunk of his car next to her mother's corpse. Jumping from the moving car, Sawyer flees into the woods. David catches up and breaks her ankle with a hammer. Sawyer stabs him in the eye with Angela's cross and slashes his throat with the shank. Meanwhile, it is revealed that Nate was an undercover
investigative journalist sent to investigate Highland Creek. Police execute a warrant on the center and arrest the hospital administrator. Six months later, while having lunch, Sawyer sees David sitting nearby. She approaches with a knife, but upon realizing it is not him, she drops the knife and runs away. ==Cast==