Suspected of abusing a prisoner during an interrogation, Major Rossi Vogel is interviewed by the IGS. Placed in custody, he takes the only path that seems open to him.

To avenge the insult done to their leader, buried without honors, Eddy, Theo, Walter and Roxane cross the yellow line. They remove Benaissa for questioning, very muscular, and manage to snatch the name of his accomplice, but accidentally kills Theo. Despite the release of their alibis, the four colleagues find themselves in the crosshairs of the IGS and the prosecutor. They are constantly questioned by Vogel and his men.

Eddy, Theo, Walter and Roxane are sinking more and more done in a spiral of violence and resentment. Eddy and Walter have two mobsters who killed Walter owed money. The homicide squad is dispatched to the offices of the Judicial Police and the General Inspection Service is on a war footing. Caught by Lemoine, Theo had to give the name of his accuser, who is none other than his lawyer. Roxane's worried about his colleagues, made of a cycle in which the young woman does not want to set foot.

Eddy and Theo joined in on a robbery Lemoine. Their goal is simple: they hope to gather the ransom to secure the release of Walter. But they realize too late that the bandit has deceived. Indeed, the judicial police is already there. Narrowly, they manage to escape by taking hostage Roxane. For his part, Bordier was able to identify the kidnapper of Walter. This is a bloodthirsty mercenary named Zoran. Meanwhile, Vogel steps up efforts to monitor the team that is becoming more likely.

Roxane's father died of a heart attack after a threatening visit to Vogel. Meanwhile, Eddy and Theo found Lemoine. At the police station, a compromising video of the robbery could allow identification of Eddy and Theo. Bordier was able to locate the place where Walter Zoran holds. Joined by Eddy, Bordier and his band of former police intervene, thwarting the spinning of the IGS. The means used by Vogel to drop the team are increasingly sadistic.

Lemoine's lawyer is found dead. The prosecutor says the investigation Vanderbeke to the Central Office for the Repression of Banditry, led by Commander Marceau. Eddy and his team must find the first mobster to avoid being compromised. During this hunt, the death of Rossi takes a new light when his wife, Helen, documents discovered in a secret safe. While Walter and Theo's friend questioned Lemoine, Eddy goes to one of his contacts to find it. But Commander Marceau managed to find Lemoine together the team of Eddy.

Lemoine is in police custody, he immediately asked to speak only with Caplan. Eddy talks with him and promises to get him out, on pain of being denounced by Lemoine and go to jail for 20 years. Lemoine was summoned to the courthouse. Eddy and his three companions are an escape plan in motion, with the aim of killing Lemoine once escaped. The latter managed to escape from the courthouse. Lemoine They bring in a forest, and kill him. Once Lemoine knee, it shows them that he had rolled: he wore a microphone and was able to forward the discussions with Eddy and other cops, the prosecutor Vanderbeke. Eddy and Theo, who braquaient Lemoine, release their gun.