Panique au grand magasin

Marcel, a sales consultant at the Galeries Lafayette department store in Paris, discovers his colleague Claude is an undercover agent investigating thefts. Instead of reporting to management, Marcel decides to conduct his own investigation, hoping for a bonus. His methods—hidden cameras from the electronics department and surveillance during lunch breaks—lead to a chain of absurd mistakes. Soon, the entire staff is under suspicion, from the stern perfume department manager to the young stock boy. The situation spirals out of control during the annual sale when a false bomb threat, accidentally sent by Marcel, triggers real panic. Now he must not only solve the crime but also save his job, reputation, and budding relationship with cashier Sophie.