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.
With the ambition to start a boutique overseas but without the means to do so, Nathalie finds herself in a desperate situation, where she would do anything to acquire what she needs. Along with her boyfriend, Eric, and his friend Bruno, she concocts a plan where she seduces clueless men and accompanies them to their places, then allows Eric and Bruno to break in. But the three soon encounter trouble after one of their schemes ends in murder.
In a mining town which has been blighted by economic downturns, an elementary school headmaster struggles to obtain social services on behalf of his students.
