When a heavily-armed Marseille anti-gang squad led by Richard Vronski escorts gang patriarch Paul Maranzano between prisons, he asks to visit his wife in the hospital, who has terminal cancer. At her request, Maranzano suffocates her with a pillow to end her suffering. He thanks Vronski for his help.

A gang organised by the drug smuggling Corsican family the Bastianis does a mass shooting at an open-air bar, targeting a rival gang, led by Nadal, killing nine attendees. One of the attacking gang members, Rizzo, is knocked down by gunfire (stopped by his bulletproof vest), and cannot escape in the getaway car. He hides his machine gun and bulletproof vest in a dumpster and blends in with the victims. Given his gang connections, he is brought in to the police station for questioning. During Detective Costa's interview with Rizzo, we learn that Costa has been working for the Bastianis and had alerted them to Nadal's plan to visit the bar. He fakes a fight with Rizzo, murders him and plants his service gun in Rizzo's hand.

Detective Willy Kapellian, whose marriage is failing, is regularly drinking excessively. One night, he gets drunk and drives away with a female officer, who is the new Police Chief, Leonetti's daughter, only to get shot at by gang members (he does not see their identity). It is police protocol to take a blood sample after a shooting incident. Fearing that Will will lose his job and go to jail for drunk driving, Captain Richard Vronski volunteers to take the blood test in his place. When Leonetti learns of Vronski's action, he suspends him.

In an attempt to rehabilitate themselves, Vronski's anti-gang unit use confiscated gang guns to mount an unsanctioned ambush of the Bastiani drug gang that is doing a major drug shipment and sale of cocaine at a creek near Marseille. Vronski was tipped off by Maranzano. But Nadal, who is also tipped off about the shipment by the corrupt cop, Costa, apparently on Leonetti's instructions, arrives to hijack the shipment. Unbeknownst to the anti-gang unit, an undercover narcotics agent was embedded in the Spanish drug smugglers delivering the cocaine, and he is killed in the four-way shootout between the Bastianis, Nadal, Vronski’s men and the Spanish smugglers. As Nadal flees, the police take and hide the money.

After incriminating evidence is found against Will, implicating him in the shooting of the undercover narcotics officer, he massacres his own family before turning his gun on himself. Meanwhile, Nadal murders Costa and his wife, blaming Costa for setting him up. Leonetti’s daughter, who is the newest member of Vronski’s unit, discovers Costa’s diary with details of payments from the Bastianis. She hands the diary to Vronski.

The Narcotics Bureau Special Ops chief Stephan Jakowitz suspects Vronski and his men of being involved in the ambush and even confronts Vronski with his suspicion. To get out of the mess he finds himself in, Vronski strikes a deal with the Bastianis in which he and his unit’s men agree to shoot their rival, Nadal and his associates. After killing them, Vronski plants the gun which killed the undercover narc on them. Leonetti, the police chief, who had been blackmailed by the Bastianis and whose incriminating dossier is handed over to Vronski as part of the deal, then closes the case, blaming the Nadal gang for t…

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• Lannick Gautry as Richard Vronski, Captain of the Anti-Gang Unit
• Stanislas Merhar as Willy Kapellian, Detective on the Anti-Gang Unit
• Kaaris as Max Beaumont, a Detective on the Anti-Gang Unit
• David Belle as Zach Damato, a Detective on the Anti-Gang Unit
• Patrick Catalifo as Anti-gang Unit Leader Georges Campana
• Jean Reno as Ange Leonetti, Police Chief
• Moussa Maaskri as Mario Costa, Detective of the Narcotics Squad
• Claudia Cardinale as Corsican crime matriarch Catarina Bastiani
• Catherine Marchal as Katia de Vrindt
• Francis Renaud as Franck Nadal
• Erika Sainte as Zoé Vronski, wife of Captain Vronski
• Ambre Pietri as Sacha Kapellian, wife of Detective Kapellian
• Jeanne Bournaud as Hélène Litvak, a police doctor
• Barbara Opsomer as Manon Leonetti
• Gérard Lanvin as Clan boss Paul Maranzano
• Eriq Ebouaney as Stephan Jankovic
• Alain Figlarz as Santu, a Corsican mobster

The film was announced in May 2019, with Jean Reno, Lannick Gautry, Stanislas Merhar, and David Belle joining the cast. Filming took place that September in the south of France.