This film noir tends to stay within very conventional plot lines, as the narration by the main protagonist, private detective Eugene Tarpon Jean-François Balmer, recites a dreary litany of how he wanted to chuck his profession until an attractive woman shows up asking him to investigate the murder of her roommate, a porno star. Soon Tarpon is up to his neck in trouble: the police, gangsters, and the victim's lover are all out to get him.

Eugène Tarpon, un détective privé basé à Paris, voit son business aller à la dérive. S'apprêtant à tout laisser tomber et à revivre en province, il fait la rencontre de Charlotte Le Dantec, une jeune femme qui va le charger d'une enquête : celle concernant le meurtre de son amie Louise...