Lino, Alban Lenoir is a talented mechanic who dreams big and tries to pull off a daring ruse: he builds an armoured Renault Clio designed to smash into a jewelry store in order to help his foster brother Quentin pay off a debt. The plan heads further than anyone expects, as the car punches through several walls and allows Quentin to escape, but Lino ends up arrested and imprisoned instead.
On day release, police detective Charas [Ramzy Bedia] enlists Lino to work for a specialized drug squad that outfits police cars to chase go-fast drug runners at high speeds by ramming rival vehicles. This unusual arrangement earns Lino a pardon and a garage to call his own, setting him up to rebuild his life while walking a fine line between duty and danger.
When Charas and Lino head to Quentin to probe his possible involvement in the drug-running operation, two corrupt members of Charas’ squad—Areski [Nicolas Duvauchelle] and Marco [Sébastien Lalanne]—strike, shooting Charas and leaving the case in turmoil. Lino flees, but is soon arrested again. The drug runners reportedly destroy Charas’ car, a Renault 21. At the station, Areski interrogates Lino and, when he refuses to lie for him, frames Lino for Charas’ murder. Lino breaks free from the interrogation room and fights his way past ten officers to escape. He then seeks out Julia, his fellow officer and lover [Stéfi Celma], who confronts him and attempts to arrest him but is unable to bring him in.
Lino learns that the burnt car recovered by the police is not Charas’ Renault, deflating a crucial assumption and widening the mystery behind Charas’ death. He returns to the junkyard where Charas was shot, and there, with Quentin, they overpower the drug runners and slip away. Quentin reveals the Renault’s hiding place and the fact that it still carries the fatal bullet from Areski’s gun. Marco and Areski murder the drug runners; Marco discovers the Renault’s preservation but keeps the knowledge hidden from Areski. Julia meets with Lino, and Quentin’s testimony alongside other evidence pushes her to believe Lino; she helps him escape from the corrupt officers tailing her.
Lino, Quentin, and Marco each arrive separately at a farm with the hidden Renault. The tension peaks when Marco fatally shoots Quentin, though he is eventually overpowered by Lino. Before dying, Quentin reveals the Renault’s exact hiding place. Areski learns that the mounting evidence could implicate him and leads the corrupt brigade to intercept Lino before he reaches the headquarters. Undeterred, Lino arms the red Renault turbo with bullbars and uses it to smash through barricades, destroying one of the brigade’s cars in a high-risk confrontation.
Lino and Julia engage Areski in a brutal car chase, while Areski douses the Renault in flames. Lino drives the doomed car back to the garage to put out the fire, and forensic work ultimately extracts the fatal bullet from the recovered evidence. Areski goes on the run, and Lino is finally reunited with Julia and reinstated with the team, closing the chapter on a perilous journey of loyalty, vengeance, and abruptly earned redemption.
