Alain is the only son of a wealthy bourgeois couple. He takes violin lessons in Ménilmontant, where he is spotted by Fleur, a poor girl: she is going to kidnap him and demand a ransom from the young man's parents, money which will be used to pay for a good lawyer for her brother accused of killing a policeman.

Jean Servais
Fournier

Pascale Audret
Fleur
Joël Flateau
'La Puce'

Fabrice
Alain Leroy-Gomez

Germaine Montero
Mrs. Leroy-Gomez

Louis Seigner
Mr. Leroy-Gomez

Yvette Etiévant
Fleur's mother

Judith Magre
Eliane Fournier

Georgette Anys
Woman who went mad

Claude Berri
Young man
Jacques Faburel
Olivier Henry
Renzo Poldi
Pierrot

Jean-François Poron
Julien

Sami Frey
Arpia