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.

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.

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.

Someone we hear talking - but whom we do not see - speaks of a project which describes the four key moments of love: meeting, physical passion, arguments/separation and making up. This project is to be told through three couples: young, adult and old. We do not know if the project is for a play, a film, a novel or an opera. The author of the project is always accompanied by a kind of servant. Meanwhile, two years earlier, an American civil servant meets with an elderly French couple who had fought in the Resistance during World War II, brokering a deal with a Hollywood director to buy the rights to tell their story. The members of the old couple's family discuss heatedly questions of nation, memory and history.