The Landbergs, a respected family of bankers, keep to tradition and money. But while David has followed in his father's footsteps and made a career at a bank, his brother Matthias is a little out of sorts and has dedicated himself to a more stress-free lifestyle. The use of their parents' vacation home on the French Atlantic coast is strictly regulated, except that David and his wife Lena suddenly burst into the summer idyll of Matthias, his girlfriend Camille and their son Etienne a week earlier than planned. Strict rules are immediately imposed. But things quickly change when feisty Camille gives free rein to her anti-authoritarian impulses and upsets the clear balance of power.