François, a gentle dreamer and humble window cleaner, falls under the spell of a young woman he spots on the seventeenth floor of a block of flats. And when she sets off on holiday to the seaside, he follows her on his bike to declare his love for her. He claims to be a novelist; she claims to be a lady of the manor. A boy, a girl, two lies, an impossible love?
| Actor | Role |
|---|---|
 Jean-Louis TrintignantFrançois | François |
 Marie DuboisMarie | Marie |
 Jean LefebvreLe plongeur | Le plongeur |
 Lucien RaimbourgLe concierge de la tour | Le concierge de la tour |
 Jean Le PoulainL'homme à la voiture | L'homme à la voiture |
 Paulette DubostLa mère de Marie | La mère de Marie |
 Bernard MussonLe patron de François chez Bokaro | Le patron de François chez Bokaro |
 Maryse MartinLa concierge | La concierge |
 Alice FieldNot listed | Not listed |
| PPierre MontbardNot listed | Not listed |
 Marcel DalioLe maître d'hôtel | Le maître d'hôtel |
 Iska KhanTogo (uncredited) | Togo (uncredited) |
 Pierre Maguelon(uncredited) | (uncredited) |
| AAlain Nauroy(uncredited) | (uncredited) |
 Roger RiffardLe père de Marie (uncredited) | Le père de Marie (uncredited) |
 Harold Sakata(uncredited) | (uncredited) |
 Léon ZitroneSelf (voice) (uncredited) | Self (voice) (uncredited) |