When an important cache of seized heroin is stolen from a regional customs depot and two officers left dead, it becomes clear that there is a mole within the customs services. Commandant Sandra Longo, of internal affairs, is dispatched from Paris to unmask the traitor.

Paris nowadays... when two corpses are found in a car boot, for Sandra Longo it is clear that those homicides have been ordered by the boss of the local Chinese mafia.