Désirée, a black girl, is nicknamed "The Shark" by her friends. This nickname comes from her strong rebellion and her ability to win in the suburban city, dominated by the power of boys.

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.

A sleazy Paris nightclub owner and ex-detective flies to Hong Kong to rescue the young son of a friend murdered by the Chinese mob.