In this riot of frantic disguises and mistaken identities, Victor Pivert, a blustering, bigoted French factory owner, finds himself taken hostage by Slimane, an Arab rebel leader. The two dress up as rabbis as they try to elude not only assasins from Slimane's country, but also the police, who think Pivert is a murderer. Pivert ends up posing as Rabbi Jacob, a beloved figure who's returned to France for his first visit after 30 years in the United States. Adding to the confusion are Pivert's dentist-wife, who thinks her husband is leaving her for another woman, their daughter, who's about to get married, and a Parisian neighborhood filled with people eager to celebrate the return of Rabbi Jacob.

Claude is a young man with a regular job, no history of trouble with the law and no chance of making any real money. He also has the brains and emotional detachment to make the big bucks as a hit man, and that becomes his new job title. A string of successful hits gets him sent to Los Angeles for his latest job. There he is accompanied by two goons: one who is perpetually nervous and the other who quickly worships the young man as a hero. The cold, ruthless hit man finally becomes unglued when he finds out that his latest target is a woman. She's a witness, set to testify against his boss, and guarded day and night by the police. It's her femininity that worries Claude: women are unpredictable, they don't do what you expect. Claude eventually proves that he is the unpredictable one and his own worst enemy.