Remy and Sandra can't have children because they suffer from the "Past Loves Syndrome". To heal, there is only one solution, they must sleep with all their exes once.
Unable to meet all the demands of his job and family anymore, Mathieu feels he's in a mid-life crisis and hurriedly leaves for the forest. His relatives are left by themselves, faced with his sudden departure and their choices.
During the summer, Jules, 10 years old, is welcomed by a young couple in the countryside, because his mother had an accident. How to feel at home in a village where its inhabitants are shaken by deep antagonisms. How not to fear what's behind « Les Hautes Herbes », the tall grass?
Ève and Henri are among the happy few of the French community in Vienna. They are “la crème de la crème”. The perfect picture crumbles when Ève discovers that Henri is cheating on her. On an impulse, she finds revenge with Jonas, a perfect young Austrian guy. But he’s not who she thought he was. This will lead them to an irreversible spiral.