 In the 30 s, in Algeria, the charming Parisian gangster Pépé le Moko (Jean Gabin) rules in the district of Casbah. Surrounded and protected by the women and his gang, he is unattainable by the French and Algerian police forces, but also he has been imprisoned in the area for two years. The police unsuccessfully try to bring Pépé le Moko to the center of Algiers to capture him, and he misses his former life in Paris and Marseilles. The astute and ambiguous Algerian inspector Slimane (Lucas Gridoux) promises to arrest Pépé le Moko the day he leaves Casbah. When Pépé meets the French Gaby Gould (Mireille Balin), she represents everything he misses in his life, and he has a crush on her, bringing a fatal jealousy in his mate, Inès (Line Noro).