Beatrice (Juliet Stevenson) and her teenage son Elliot (Alex Lawther, The Imitation Game) spend a week packing up the contents of their remote holiday house in the South of France. Fifteen-year-old Elliot struggles with his dawning sexuality and an increasing alienation from his mother. She in turn is confronted by the realisation that her marriage has now grown loveless and the life she knows is coming to an end. When an enigmatic local teenager, Clément (Phénix Brossard), quietly enters their lives, both mother and son are compelled to confront their desires and, finally, each other. Departure is an intimate story beginning at dawn on the first day and ending at night on the sixth day, charting the end of a summer, the end of a childhood and the end of an otherwise nuclear, middle-class family.