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.

Alex and Laetitia appear to make the perfect couple. But, as much as he loves his gorgeous fun-loving sweetheart, Alex isn’t yet ready for her to move in with him. Laetitia has other ideas. She has already packed her bags and lets Alex know that she will be taking up residence in his apartment within a few hours. For Alex, this is his worst nightmare come true. In desperation, he persuades his best friend to simulate an attack of depression so that he can move in with him...

For those who were young, living under the delusions of love and soft drugs in Paris, May 1968 - even if the guitar is still playing, they can't hear it any longer.