Georges Guichard is painter of hot cinema posters and is a very romantic boy.This night he goes to the cinema of the Saint Lazare station, he notices an elegant woman and sits near her, at the end of the film he convinces her to drink a coffee with him, she is married and lives in the suburbs ;she orders two martinis and a sandwich.But she has to leave now and Georges proposes to meet together next day at the concourse of the railway station.She can't come the next day but sends a note.Georges is happy to learn that her name is Yolande.Later she will visit him in his apartment for a while and again she must leave soon.So begin little by little their romance.