Paris, 2010. An isolation wall surrounds the ghetto cities of District B13. Within these walls, without effective law enforcement, gang rule is absolute. Damien is a member of an elite police squadron, highly trained in martial arts. He goes undercover to infiltrate a gang in order to defuse a neutron bomb and save District B13 from annihilation. Damien recruits the help of a criminal named Leïto -- whose only goal is to save his sister from the clutches of the same gang.
Gorgeously choreographed gymnastics of pain elevate DISTRICT B13 over the impossible missions and last stands of the season.