Lynn Blodgett is an accomplished artist whose work often leans into disturbing imagery of monstrous clowns, and who lives with a deep-seated fear of clowns called coulrophobia. Her nights are haunted by a vivid nightmare where she’s a young girl, confronted by a clown with a decomposing face after a carnival car crash. These troubling dreams intensify after she files for divorce from Bert Tokyo, a doctor who reacts violently upon hearing the news and who is fighting for full custody of their son, Nicholas. One evening, a shirtless clown with piercing black eyes and a battle axe—Shivers—stares at Lynn’s house and then disappears into the night. The next morning, she’s shaken by the news that a nearby family she was house-sitting for has been massacred, a event that seems to echo the horrors she’s been dreaming about.
Later, at a gallery where her work—often centered on grotesque, animated clown figures—hangs in provocative arrangements, she meets Tuck Reed, a roller-coaster magnate who shows immediate interest and purchases one of her paintings for about $8,000. Tuck invites Lynn to his office for a tour of his business empire, where the two share a growing curiosity about each other. Their walk is abruptly interrupted by a mugger, a violent encounter in which the assailant, Heston(/actor/ted-taylor), jostles them, but they manage to escape. The encounter leaves Lynn rattled, though she tries to push aside the offer from Tuck to stay at her house. A subsequent call from the gallery owner raises old fears, and Lynn faints at the sight of Shivers standing on her patio, further confusing those around her and prompting police involvement that ultimately questions—yet does not fully believe—her terrifying tale.
The gallery’s summons continues as Lynn reluctantly accepts a bold job: a commission for $20,000 to paint a man’s father—a clown who is also a convicted child molester. All the while, Shivers is tormented by voices that tell him his “cure” lies in tormenting Lynn, pushing him to press forward despite the danger it creates. Back in the legal world, Bert negotiates with his lawyer, insisting on not only obtaining full custody of Nicholas but also demanding child support and half the rights and profits to all of Lynn’s paintings sold since their marriage. The revelation that Bert has been out of work for six months and has fabricated his professional obligations adds another layer of strain and opportunism to his plan.
Shivers escalates his campaign, stalking Lynn as she walks with Tuck. He claims another victim, Lynn’s friend Amanda, a murder that shocks her and pushes the investigation into a more serious direction. Detective Peters reaches out to Lynn, confirming Amanda’s death and the presence of grease paint beneath her nails and in a colorful pattern on a window, a clue that erodes Lynn’s credibility in the eyes of some authorities even as she clings to her story.
In a parking lot, Bert meets with Heston(/actor/ted-taylor), whom he has hired to remove Lynn from the equation and secure life insurance proceeds. Heston pushes Bert for more money as the complications created by Shivers and the police mount. Bert then visits Shivers, only to learn that Shivers is actually Doug Richardson—an ex-patient of Bert—who is a sex offender with Leber’s congenital amaurosis. Bert’s plans grow even more precarious, and he orders Shivers to leave Lynn alone, a directive Shivers largely ignores.
The plot thickens when Shivers stages a distraction by sending a party clown to Lynn’s home to draw away the guard; the guard is decapitated, and Shivers spots Heston nearby. Heston breaks into Lynn’s house but is confronted and fatally wounded during a struggle with Lynn and Tuck, who had stopped by. At the Tokyo residence, the tension peaks as Shivers murders Bert after Bert’s scheme to have Heston kill Lynn backfires, sealing Shivers’ narrative as the “unfixed” killer in the eyes of some, and leaving Lynn ambivalent about the official version of events.
Choosing to celebrate an earned windfall, Lynn agrees to go on a theatre date with Tuck after the painting sale, even as the truth about the “cure” and Shivers’ intentions lingers in the background. Shivers doesn’t relent; he continues his brutal campaign, killing Lynn’s boss and abducting Nicholas after dismembering the babysitter, then breaking into the theatre to slaughter two employees. As Shivers pursues Lynn and Tuck through the venue, Detective Peters races toward the theatre, alerted by a 911 call and the revelation that DNA from Amanda’s nails matches the suspect, Doug. In a desperate final ploy, Shivers uses Nicholas to lure Lynn out; Tuck disables the clown by blinding him from a projectionist booth, giving Peters and the officers a window to move in and arrest him.
With the danger contained, Lynn returns home to a quiet that’s already haunted by the possibility of Shivers’ escape from prison. The ending lingers on a nightmare-like vision of a released Shivers attacking her and Nicholas, a reminder that fear can outlive the night and cast a shadow on every day to come.
