Happy End

The film starts with clips secretly filmed with a smartphone by Eve Laurent, a teenager, showing her mother and overlaid with text messages from Eve saying that her mother is selfish and uncaring. The last clip shows Eve's mother unconscious and Eve admitting that she poisoned her with sedatives.

The next scene shows security camera video depicting an accident at a construction site. The site's construction firm is owned by Anne Laurent, Eve's aunt. Anne is then shown having dinner with her father, George Laurent, who suffers from dementia, as well as her son Pierre, who is implied to have a drinking problem, her brother, Thomas Laurent, and his wife Anaïs. They all live together in a large mansion in Calais. We learn that the accident injured one of the construction workers and he will probably not survive his injuries. Pierre is shown going to a banlieue where he is confronted and knocked down by a young man, later implied to be the son of the construction worker injured in the accident. Pierre then flees the mansion and hides in an empty apartment, where he is found by Anne. They have an argument during which she asks him why he started drinking, accuses him of not taking his job in the construction firm seriously, and tells him that had he gone to the police after being beaten up, their chances in their legal dispute with the family of the construction worker would be much better. We later see her and her lawyer talking with the family, offering some money and trying to dissuade them from suing by threatening to press charges for the physical assault on Pierre by the worker's son. Pierre is later shown trying to embarrass his mother by calling one of the housemaids a "slave" in front of a large gathering during a party at the mansion. Read more on Wikipedia.