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.

Lino Venturaas Principal Inspector Marceau Leonetti
Marlène Jobertas Jeanne Dumas, the new auxiliary
Michel Constantinas Greg, the henchman
Paul Crauchetas Jacques Loring, Martin's neighbor
Alain Mottetas Frank Lambert, Leonetti's colleague and friend
Guy Heronas Soramon
Albert Dagnantas Arnold
Monique Mélinandas Mrs Loring
Marcel Pérèsas Mr Lenoir