Greg is a police lieutenant; he must collect informations on eco-activists, infiltrating them for months. Myriam, a young free woman, is fighting to save a forest from the building of a dam. They meet and fall in love on the Zone. A beautiful life, a joy that Greg discovers, despite the risks of being unmasked. For each of them, time is short: soon everything will disappear.

End of summer. An isolated house in the countryside. Jo, devoted to music creation, spends her time locked in her barn composing. She neglects her little brother whom she takes care of. A few days before a new tour, she discovers her body has been transformed.

Françoise has just been dumped by her husband for a much younger woman. In order to cheer her up, and to celebrate her 60th birthday, sisters Rose and Alice decide to take their mother to a resort on the tropical island of Reunion so they can relax, work on their tans, and have too many margaritas. But when Rose pays a one-night stand, Thierry, to show her mother a good time, their holiday plans start to unravel.

Two couples, Pierre and Aimée, Éric and Pénélope, all share four years of friendship without cloud. Only concern, Penelope and Pierre have become lovers ... The situation becoming untenable, they decide to break. But after a final night of passionate love, fate plays a trick on them: Peter and Penelope each wake up in the body of the other! To protect their secrecy, they each find themselves having to live the life of the other. This is the beginning of the complications ...