While Saïd's group is busy recruiting, they are urgently called back to Versailles: two narcotics officers have been targeted. Ferracci, convinced that the narcotics squad is not sharing its information, puts pressure on the team to find the dealers who shot the police officers.

The BRI is trying to identify the drug dealer who was robbed. Socrates approaches Inès, the superior of the two police officers who were shot. She finally gives him the name of the dealer: La Mangouste. Vanessa, Badri, Julien, and Jill travel to Spain to try to find him.

The gang of drug dealer robbers who kidnapped Mangouste contacts his wife Sadia and demands a ransom. The BRI activates its kidnapping protocol, but Sadia doesn't tell them everything.

Informed by Inès, the BRI tails a drug convoy led by Nina Perez. The truck is attacked by robbers who start shooting. Faced with a highly trained team, the BRI finds itself in serious trouble.

After a violent shootout, the team is in shock. Meanwhile, Saïd is unreachable. Vanessa takes charge of the group. Under pressure, Inès confides in Socrate: Vingre suspects her of double-crossing him.

Helpless, the group follows a lead that Saïd had discovered before his disappearance. But the robbers are still one step ahead, and set a trap for the BRI. Vingre discovers that Inès has given information to the BRI.

Saïd is back. Battered but bruised, he resumes the investigation. The group is getting closer and closer to the robbers: the BRI discovers that a huge shipment of drugs is due to arrive in Le Havre. They know that the robbers will also be there.

Working with the BIS PP group, Saïd's group prepares to intervene as the robbers board the cargo ship. Socrate and Ferracci, meanwhile, are hot on the trail of Vingre.