The film starts in the 13th arrondissement of Paris in 1984. Robert Pinot is a police officer as ordinary as clumsy. One day, he stops a certain Josyane, a young drug addict who is also doubled as a pickpocket, nicknamed Marylou. Having discovered that she comes from the same village, Nanteuil, then him, he takes compassion for the young girl and decides to take her under his wing to keep her away from Tony, a dangerous dealer with whom she is in love.
Gilbert, assigned to incinerate old banknotes at the Bank of France, lives with his wife, Gisèle, and his young son, Thomas. A few years earlier, he had formed a rock band with Serge and Gisèle's brother, Marc. The latter, abusing his naivety, make him believe that he has been robbed of a briefcase containing a million dollars and that, because of his fault, Marc is in danger of dying. The objective is to force Gilbert to put his incinerator out of order to facilitate the bank robbery. Gilbert refuses at first, then gives in. But he discovers that he has been cheated. To get revenge, he tells the police the date and time of the robbery.
