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After the tragedy at the ambassador's reception, Racheton and William must return to France. Defying his superiors, William stays in Morocco to continue tracking down the Jebli family. Driss is determined to take revenge on the Benali son and regain control of the family land himself, at the expense of his uncles, who are not pleased with this power grab.

William confesses to his colleague Taz that he has been duped by his informant. They decide to follow him, only to find themselves in Driss's path. Forced to sell the cocaine stolen in the robbery, the young student begins dealing at Parisian parties, under the reproachful gaze of his girlfriend Inès.

Driss, blinded by his hunger for revenge, has finally managed to track down Benali. But following Moussa's information, the Customs raid his home. Racheton and William are compromised and will do anything to protect themselves. William must now go all the way to arrest his former ally.

Thanks to their alliance, Driss and William rise to power in their respective circles. William shines in the drug squad, making one record seizure after another, creating jealousy between the various law enforcement services. Driss is flooding the market with his product, while his clients are dropping off one by one. Left in the dark, Moussa becomes suspicious of his brother's spectacular rise.