After years of absence, Agatha returns to the sea resort of her childhood, in Normandy, with her six years old son, Honoré. On edge, loaded with memories, she paces along the boardwalks of Deauville, while her son stays alone in the car. To his few questions, she gives no answers. On the wide beach of Trouville, in front of the old Hôtel des Roches Noires, she leaves him one more time. The film is freely inspired from Marguerite Duras's play, Agatha.