"Le roman d'un truqueur" mixes the story of a fictional investigation with the reality of its filming by the author, in a spirit of humor, self-mockery and pastiche. After having unscrupulously infiltrated the action, the producer, confusing fiction and reality, tries to hijack the investigation for his own benefit. Entangled in their investigation, but true to their role, the actors thwart the producer's schemes and then look for a financing solution themselves to bring the film to a successful conclusion.

Francois Marboni is a butcher who is being blackmailed for having an affair with the prostitute Rachel in this black comedy. He decides to hire a hit man when the blackmailer demands that he start cutting his profit margin to the bone. Francois soon becomes a target of the hitman he hired.