It sounds like you’re referring to (known in English as The City of Fear ), a cult French comedy film from 1994 directed by Alain Berberian, starring the legendary comedy trio Les Nuls (Alain Chabat, Chantal Lauby, and Dominique Farrugia).
The film’s lead actress is a gorgeous but talentless starlet named (Chantal Lauby). Her dialogue is laughably bad, her acting is wooden, and the film’s plot makes no sense: a killer wearing a diving mask murders people with a claw hammer while a detective repeats, "The murderer is the one who kills people." The "Murderer" Arrives During the screening, a strange man in a diving mask and wetsuit—exactly like the killer in Red Is Dead —walks into the theater. But instead of a claw hammer, he’s carrying a baguette . He walks up to a film critic and beats him to death with the bread. No one is sure if it’s part of the film’s promotional stunt or a real murder. cite de la peur
In the final confrontation, the director (in diving mask, holding a baguette) explains his elaborate, pretentious motive involving the death of cinema. Simon, trembling, tries to arrest him but trips. Agnès, by pure accident, knocks the director unconscious with a falling prop tombstone. The film ends exactly as it began: with a screening. Red Is Dead becomes the biggest hit of the year, not because it’s good, but because people think the baguette murders were a genius marketing campaign. It sounds like you’re referring to (known in
Here is the of Cité de la peur . The Setup: A Terrible Film Festival The story begins at the Cannes Film Festival (the "Cité" of the title is a pun on "Cannes"). A low-budget, absurd horror film called Red Is Dead is about to premiere. The film’s producer, a nervous and clumsy man named Serge Karamazov (Alain Chabat), is desperate for success. But instead of a claw hammer, he’s carrying a baguette
It’s not a “long story” in the literary sense (like a novel), but rather a parody of crime thrillers and film industry tropes. However, I can tell you the as a long, detailed narrative.
The killer is (played by the director of the real film, Alain Berberian, in a cameo). Why? Because the director was furious that Serge had rewritten his script, turning his serious psychological thriller into a stupid horror-comedy. So, he decided to literally kill the film by murdering people in the most ridiculous way possible—with a baguette—to make the whole project a laughingstock.