Lepetit, an ambitious and determined man, is named the new CEO of a department store. His mission is to improve the store's financial position. He decides that the human factor will be his catchword and introduces new methods, which he also applied to himself. But tensions slowly arise between members of the staff.
At Christmas time, 19-year-old Simon returns home to visit his dysfunctional family with Louise, a fearless girl he met during his train ride. While Simon struggles to cope with the growing distance between him and his parents, he starts to examine his feelings when Louise develop a liaison of her own with his childhood friend Mathieu.
To be closer to his children following his divorce, Laurent Monier, a history and geography teacher in a peaceful provincial high school, accepts a position in a sensitive college in the Paris suburbs. He is assigned the hardest class, the fourth techno, and he finds an apartment in the Cité des Muriers, a particularly difficult district.
