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It relates the happenings of a summer afternoon in the lives of a woman and a man, both middle aged, who have moved to a town on the French Mediterranean. He, an unemployed programmer,is invited to lunch by his young neighbour. She, an office employee, lets herself be carried off during her lunch break to sea and to a distant beach by someone she vaguely knows. Both, more or less without meaning to, stray into situations of seduction which then take an adventurous turn.