Gustave Folcher, a French farmer, wrote in his 1939 diary that the summer had been long and hot. He was not alone. Many other anonymous French men and women wrote of the beauty and warmth of those summer months and how threats of war were far from their minds. Through home movies, diaries and letters, One Last Summer describes the final weeks of peace in France and the mix of blindness, denial and prophetic clear-sightedness of those facing the war that was about to unfold.
| Directing | Ruth Zylberman | Director |
| Production | Céline Nusse | Producer |
| Sound | Nicolas Repac | Original Music Composer |
| Editing | Valérie Loiseleux | Editor |
| Production | Marie-Hélène Barbéris | Researcher |
| Sound | Arnaud Ledoux | Sound Editor |
| Editing | Isabelle Laclau | Color Grading |
| Production | Alice Tubert | Production Assistant |
| Sound | Arno Ledoux | Sound Recordist |
| Sound | Aurélien Bony | Sound Recordist |
| Editing | Anaïs Berthier | Assistant Editor |
| Art | Olivier Marquézy | Graphic Designer |
| Production | Florence Guinaudeau | Production Manager |
| Production | Léa Lagan | Production Assistant |
| Production | Alexis Coudray | Production Assistant |
| Crew | Florian Lobstein | Technical Supervisor |
| Production | Claude Szwimer | Production Manager |
| Production | Xavier Martinot | Production Manager |
| Production | Benjamin Gourier | Production Assistant |
| Production | Claudine Mourette | Production Assistant |
| Production | Nadine Belkacemi | Production Assistant |
