Claudine is a glamorous, fiercely devoted single mother and dressmaker living a quiet, highly structured life in a remote valley near the Swiss Alps. She dedicates nearly every waking hour to caring for her 17-year-old disabled son, Baptiste, meticulously maintaining a peaceful, safe environment for him—even going so far as to write him fake letters signed by the father who abandoned them years ago. However, every Tuesday, Claudine allows herself a temporary window of total freedom. Leaving her son with a trusted neighbor, she takes a train up to a high-altitude mountain hotel, sheds her domestic persona, and selectively seduces lonely, anonymous male travelers who are scheduled to leave the next day. By strictly choosing men who will vanish immediately, she enjoys physical intimacy without the emotional complications that could disrupt her son’s life. But her meticulously compartmentalized world is thrown completely off balance when she hooks up with Michaël, a German engineer working temporarily in the area. Refusing to play by her rules, Michaël decides to extend his hotel stay solely to pursue her, forcing Claudine to confront her deep-seated fears and decide if she can risk tearing down her carefully constructed walls to imagine a different life for herself.