Hélène, a model mother around 50, is far from someone made for adventure. When her children come to celebrate her birthday at her house, Hélène, who seems to have long since made do with a neat and simple life, gives into memories. Of that summer, her first without their dad, when she took the kids to the world surfing championships. Of her boldness, then. In the privacy of night, she entrusts her astonished daughter with the details of an encounter that might have changed everything.