At the BRI Versailles, a unit specializing in organized crime, Saïd leads a team of young cops. He will lead Badri, Vanessa, Julien and Socrate and will have to take up the challenge of succeeding Patrick, a respected former chef. Éric Perez, an informant thug from Patrick, tries to warn Saïd that a gang war threatens to set the capital ablaze. A shooting breaks out, a man and a child are on the ground.

Thanks to the intelligence services, the BRI obtains the name of the second shooter. Éric Perez, Patrick's informant, assures Saïd that he knows who ordered the shooting. As Saïd and Julien follow a suspect, they come across Socrate going it alone.