In Paris, many citizens go to the precinct after the doors of their apartments have been sprayed with a 4 and the letters "clt". When a dweller is found mysteriously dead in his apartment, Detective Jean-Baptiste Adamsberg and his partner Danglard investigate...

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.