During their vacation in Tuscany, Italy, Bjørn and Louise, a Danish couple, and their daughter Agnes, meet Patrick and Karin, a Dutch couple, and their son Abel, with whom they spend a pleasant evening at dinner. Bjørn and Louise receive an invitation from the Dutch couple to visit their remote rural house in the Netherlands. During the first two days, Louise feels uncomfortable about the hosts' passive-aggressive behaviour, such as the disdainful way they treat Abel, who they explain was born with no tongue. Her concerns are exacerbated when they are invited out for dinner, unaware that the children were to be left at home accompanied by an unknown babysitter called Muhajid. At dinner, Patrick challenges Louise's vegetarianism after ordering multiple meals containing meat, then drunkenly makes out with his wife in front of them. After manipulating Bjørn into paying for the dinner, Patrick drives drunk and blasts loud music, upsetting Louise. He also enters the bathroom while she is taking a shower, and later observes the couple having sex. When Agnes's calls to sleep next to her parents are ignored, Patrick takes her. Louise finds Agnes sleeping next to a naked Patrick, causing the family to leave, only to turn back after Agnes realizes that her rabbit doll Ninus is missing. Back at the house, they are convinced to stay longer. Later, the couple discovers that Patrick lied about being a doctor to impress them and is actually unemployed, as he does not believe in actual work. After dinner, the couples argue over Patrick's abuse of Abel after Patrick throws a mug at him.