The young Suzy is a nightclub hostess in a cabaret in which Frehel is the star. Because one night she gets propositions from a rich widower who would like to have her as his girlfriend, Suzy wishes to leave this place, where she has no future, for a better one. Abandoned by her protector, a young hoodlum named Robert, she gets the occasion to get away from it. She decides to go on vacation on the Riviera and stay at the Chateau des Cedres, the former residence of a noble family that has been transformed into a bourgeois guest house by the baroness Saint-Leu. Shy and elegant, in her modest suit, Suzy stays there under the name of Suzanne Michelet and soon makes new friends among the young people of very wealthy families.

While celebrating his birthday, police inspector Basquier recalls two of his most celebrated cases. The first involves duplicitous moneylender Olga. The second concerns the brutal broad daylight murder of innocent young Yvonne.

A tough customs man, out to get a youth smuggling tobacco into France across the Belgium border, falls for the jaded ex bar hostess the smuggler lives with.Meanwhile the young man is intrigued by another, more innocent girl.

Smuggler's Ball is the English-language title for this French-Belgian seriocomedy. The action takes place along the borders separating Belgium, Holland and France. It is here that the worldly Pierre (J. P. Kieran) carries on a profitable smuggling operation, all the while romancing Siska (Christian Lenier), the daughter of a local customs official. Various subplots and secondary characters weave in and out as the plotline guides the viewer through the WW II years. Towards the end, the story shifts gears when the Benelux Frontier Agreement eliminates all government regulations. The film's screenplay is by Charles Spaak, himself the descendant of a Belgian political family, and thus well-versed in bureaucracy and red tape.