Vinny Durand is a New York City taxi driver who is obsessed with the international cult actress Jana Bates, known as the "queen of horror films". Vinny returns to his apartment where he lives with his mother (played by Joe Spinell's real life mother). He tells her that he leaving to attend the Cannes Film Festival in France hoping to meet Jana Bates and get her to star in his movie to kickstart his career as a film director. But his mother calls it just another one of his "crazy ideas."
Vinny arrives in Cannes. He tries to meet Jana several times, but is turned away. Jana is in Cannes to promote her latest horror film Scream in which she has been nominated for Best Actress. Accompanying Jana is her manager and ex-husband Bret Bates, and the film's producer Alan Cunningham, her current beau. Vinny phones Bret, insisting on talking to Jana about his script, but is told only agented scripts are accepted. Shortly afterwards, Jana is at a press conference with Alan when she receives flowers and a note saying, "You've made your last horror film. Goodbye." She goes to see Bret at his hotel room. Entering the bathroom, she finds his bloody stabbed body in the bath. Bret's severed head rolls off into the sink and Jana runs away screaming. When she later returns with the police, the body is gone. Vinny has fantasy scenes of himself being acclaimed as a great director. Meanwhile, he encounters some naked young women bathing at the beach at night and picks up one of their stockings, but is confronted by one of the women who taunts him before running back into the water. The women call him a weirdo and Vinny runs off.
Vinny continues following Jana around and filming her with his movie camera. Marty Bernestein runs into Vinny and shrugs him off when Vinny asks him if he is willing to promote his movie. Marty meets with the movie's director Stanley Kline, and his personal assistant Susan Archer, where they reveal that all of them have received the same notes that Jana and Bret received. But when Marty takes his suspicions to the police, they think that Bret's disappearance is another publicity stunt. The next day, Marty gets a letter from Bret to meet him in a theater screening room. When Marty shows up, he is hacked with a hatchet by a hooded figure.
While Jana attends more press conferences, Vinny goes to a nightclub where he attacks a stripper after seeing her as Jana. He goes to a local cinema where he watches a gory horror film of Stanley Kline, and runs into him outside the theater. The following day, Susan tells Stanley that she wants to leave Cannes, but he convinces her to stay a while longer. That evening, both of them are killed by the hooded figure atop a building where Stanley is stabbed, and she falls off the building's ledge after getting shot. The killer then takes his movie camera and films all the deaths.
Across town in Jana's hotel room, Vinny sneaks in with a bottle of champagne and surprises Jana as she is taking a shower. He asks her to appear in his movie, but she insists he leave immediately, causing Vinny to break down in tears. Angered and upset, Vinny smashes the bottle in the sink and threatens Jana with the bottle's jagged edge. When the doorbell rings, Jana shoves Vinny aside and sprints off. Jana, clad only in her bathroom towel, runs screaming through the hotel lobby being chased by Vinny. The people in the lobby think it is another publicity stunt and applaud. Vinny, caught off guard, stops and smiles for them, allowing Jana to escape, who runs into Alan and a group of reporters outside the hotel. After explaining what happened, Alan tells Jana that he will take her away from the city.
The next day, Alan drives Jana to a remote castle in the French countryside where a musician friend of his named Jonathan is staying. Vinny follows them. That evening, Vinny sneaks into the castle, but is chased away by Jana's bodyguards who accidentally kill Jonathan as he tries to stop Vinny.
Alan and Jana return to Cannes for the awards ceremony where Vinny sneaks into the festivities dressed as a local policeman. While Jana waits in the back wing of the building, Vinny subdues Jana with chloroform and takes the unconscious actress away in his car back to the castle to film a scene there. Vinny films a scene with him playing Dracula and Jana as a victim. Suddenly, Bret Bates shows up with another camera and a pistol, and congratulates Vinny on setting everything up for him. Bret is revealed to be the killer and the mastermind behind this whole thing, not Vinny. Bret reveals that on the day when Vinny phoned him about his movie proposal, he realized that he had the perfect fall guy to set Vinny up for all the killings and to get even with Jana for leaving him. Vinny throws his cape over Bret, distracting him, and runs. But Bret grabs Jana and taunts Vinny to come out in the open. Outside, Vinny turns on a motorcycle's headlights, blinding Bret, and as Jana steps aside, Vinny murders Bret with a chainsaw. As Alan arrives with the police, Vinny stands before Bret's dead body and screams.
The image falls back to reveal that the whole story is a movie that Vinny filmed at the Cannes Film Festival with Jana Bates, and he is now back in New York showing it to his mother in a screening room. His mother tells Vinny that she is finally proud of him for directing and starring in his first movie, but Vinny explains that it will be his last horror film. As Vinny starts to talk to his mother about ideas for his next movie, she interrupts him to ask for a joint. The two share a smoke as the film ends.
