Marceau Léonetti, a competent and energetic officer stops by chance the son of an influential lawyer driving under the influence of alcohol. A few months later, the lawyer falsely accuses Léonetti as being violent and incompetent. As a result Marceau is transferred to a small police station, where he meets young and beautiful Jeanne. Soon they are faced with a tough investigation.
Back from Indochina, Tony and Dick, two French soldiers, are now in possession of more than 20 million, entrusted by a trafficker. They buy a nightclub in the district of Montparnasse but are soon hunted by the thug who wants to recover his money.