Richard, Gilles and Philippe have been friends for nearly 50 years. For the duration of one summer, they set sail with their partners on a magnificent sailing boat, heading for the Mediterranean island of Corsica. But things do not always go smoothly on board, especially since each couple has their own problems, and the weather has some surprises in store for them. Between the laughter and the confessions, old grievances and jealousies gradually come to the surface. The trio find themselves taking stock of their lives and their relationships to the others. Will their friendship weather the storm?