In Amma Beach, Maine, five-year-old Polly Turner accompanies her pretty mother, Melissa, to the grocery market. Polly sits in the child-carrier seat of a shopping cart, clutching a doll, Chinga. As Melissa strolls the isles, she attracts the attention of Dave the Fishmonger. Polly notices Dave, and tells her mother she doesn't like the store. Melissa responds by quickly pushing the cart into another area of the market. As Melissa strolls down the frozen food section, she comes upon the image of Dave, reflected in the glass of a cabinet, a knife protruding from one eye. A horrified Melissa tells Polly they are going home. But as Melissa makes her way towards the store's exit, customers begin clawing at their eyes. Back in the butcher section, Dave's attention is diverted by the shape of a large Chinga doll, as reflected in a metal door. Dave grabs a knife from his belt... but suddenly turns it on himself.
Vacationing in Maine, Scully turns her rental car into the grocery market parking lot. An Old Man exits the store and tells Scully that a doctor is needed. Inside the store, observes Dave, a knife protruding from his eye. She telephones Mulder and describes the bizarre situation. Mulder tells his partner the event might be the result of witchcraft or sorcery. Scully, however, can find no physical evidence that might support this theory.
Assisted by Police Chief Jack Bonsaint, and his deputy, Buddy Riggs, Scully reviews security camera footage of the event. She notices Melissa Turner rushing towards the exit, the only customer unaffected. Bonsaint tells Scully that some townspeople believe Melissa is a witch. Buddy Riggs telephones Melissa with news that Bonsaint will be questioning her about the occurrence at the super market. Riggs promises to help Melissa, but she warns him to stay away. In the background, unseen by Melissa, looms the shadow of the large Chinga doll.
Bonsaint and Scully visit Melissa's home, but find it unoccupied. Bonsaint tells Scully that Melissa had married a fisherman, but was widowed when the husband was killed in a boating accident. Bonsaint explains that there had been an incident between Polly and the proprietor of a daycare center, Jane Froelich. It seems that Jane slapped Polly when she became uncontrollable. Shortly thereafter, Jane claims she was thrown to the ground. Bonsaint, however, believes the little girl never touched Jane. Bonsaint then tells Scully that Dave the Butcher's interest in Melissa was unrequited.
Riggs meets Melissa and Polly at an ice cream shop. Melissa describes how she has seen images of violent deaths, such as Dave's, before they occur. Riggs give Melissa the key to a remote cabin and suggests she leave town. Meanwhile, Polly grows upset when a girl clerk does not meet her demand for more cherries. Shortly thereafter, the clerk's pony tail gets caught in an ice cream machine. Riggs jumps the counter and rescues the girl.
Scully and Bonsaint pay Jane Froelich a visit. Froelich claims Melissa is the descendant of witches--and she is passing her cursed lineage to Polly. Later, while speaking with an official at a ranger station (near Riggs' remote camp), Melissa experiences another vision, this time seeing Froelich's bloody image reflected in the rear window of the car. Melissa turns the car around and heads back home. Meanwhile, Froelich hears the song "Hokey Pokey" emanating from the day care center. She makes her way through the darkness... and comes upon the big Chinga doll. She picks up a piece of broken phonograph record, but instead of using it as a defensive weapon, turns it upon herself. Later, Melissa experiences another vision... this time seeing Riggs' corpse. Riggs finds Melissa at home, and convinced she had something to do with Froelich's murder, insists she accompany him to the police station. Later, Riggs' body lies on the kitchen floor, his nightstick covered with blood.
Scully recognizes the Old Man from the supermarket aboard the boat where Melissa's husband was killed. The Old Man tells Scully the story of how Rich Turner came upon the Chinga doll while checking lobster traps. Rich intended to give the doll to his daughter, but several days later the Old Man found Rich's body, a grappling hook through his skull.
Melissa begins nailing shut every door and window in the house. Polly tells her mother she cannot sleep, and Melissa promises the noise will stop. Moments later, Melissa sees a bloodied reflection of herself in a window, a hammer buried in her skull. Scully and Bonsaint drive to the Turner home. Scully, peering through the windows, discovers Melissa attempting to set fire to Riggs' body. Bonsaint breaks down the door as Melissa runs to a closet and grabs hold of a hammer--which she turns upon herself. Thinking quickly, Scully grabs the Chinga doll and throws it inside a microwave oven in the kitchen. As the doll melts, Melissa drops the hammer and regains her senses. Later, another lobster fisherman pulls a trap from the water... and discovers the burned Chinga doll inside. Suddenly, its eyes open.