Sylvain Théron, 35, is found dead on the bank of a river where Roger Lefort, alias "Lucky" teaches a gold diggers course. Lucky found 3.8 grams a few years ago and set up a business that includes the courses, a campament and "La Pépite", a bar run by his sister Marithé. As per Théron's ex-wife testimony, Sylvain had recently got big money and told his ill 15-year-old son, Elliot, he had found a gold vein; this information made Mark, his mother's new partner, angry. Paul does not believe the gold vein hypothesis for he is confident that the river produces no gold for a value greater than 20 euros. Léa sends Lieutenant Erwan Lebellec infiltrated to prove Paul wrong. Privately, Paul and Léa remain concerned about their children's college entrance exams and Alice's boyfriend, Julien Garrido. Léa also finds out that the colonel wants to open a file on her for irregularities in investigations and to request her transfer. Her concerns lead the commander to accept yoga classes with Gregory, an instructor her mother has found for her.
—mgallegog