MURDER à LA MOD

In a prologue shown from the point of view of a camera viewfinder, a series of female models in a studio are asked by an off-screen cameraman to undress for a screen test. One model is seemingly stabbed by the unseen man behind the camera.

During an afternoon of shopping in Manhattan's boutiques, Karen, another model, tells her socialite friend Tracy about her fiancé Christopher, a photographer and widower. Tracy visits her bank to withdraw money and jewelry from her safe deposit box, which she places inside a large envelope. Meanwhile, Karen catches sight of Christopher in the street and follows him to his studio, where she discovers he is shooting a sexploitation film featuring a deranged prankster, Otto.

Christopher remorsefully tells Karen that he lied about being a widower, and that he is reluctantly working for the film's producer, Wiley, because he urgently needs money to obtain a divorce from his wife. Karen pleads with Christopher to let her help raise the money. Returning to Tracy's parked car, Karen finds Tracy has gone inside a dress shop, leaving the envelope of valuables under her car seat. Karen impulsively steals the cash from the envelope and hurries back to Christopher's studio, intending to give him the money.

Entering the building, Karen is surprised by Otto, who pretends to stab her with a dummy ice-pick, a prop from Wiley's film, and splashes her with ketchup as a practical joke. After walking inside the studio and cleaning herself up, Karen is then stabbed to death by a genuine assailant wielding a real ice-pick.

The film then shows events from the viewpoints of the three other main characters: Tracy follows Otto, who is wheeling a large trunk apparently containing Karen's corpse to a nearby cemetery; Otto discovers Karen's corpse in the studio and attempts to lure the killer to the cemetery with an empty trunk; while Christopher, who has been spying on Karen and Tracy during their shopping expedition, pursues Otto and Tracy to the cemetery. The killer is revealed to be Christopher, who has secretly filmed his murder of Karen.

After a fight in the cemetery, Christopher and Otto both return separately to the studio. Christopher kills Wiley when he finds him watching the footage of Karen's murder. He then turns and is shocked to see Karen's corpse apparently moving towards him and brandishing an ice-pick, with which she fatally stabs him. Otto, who is then revealed to have been holding up Karen's body as another intended prank, realizes he has mistakenly used the real ice-pick to stab Christopher, and laughs at the irony.

Christopher is revealed as Karen's murderer, but in a twist, Otto accidentally kills him with a real ice-pick while intending another prank.

The ending underlines the film's playful yet morbid tone, blurring reality and performance. Otto's final prank fatally backfires, delivering ironic justice and showing how the confusion between fake and real violence can have deadly consequences.