Customs inspector Simon Weynachter and his team uncover a scam involving two Tunisian criminals from the neighbourhood of Belleville and a trader from an upscale area.
Fitous, Bouli and Attias prepare a new scam around the purchase and resale of carbon quotas; a whistleblower reveals the possibility of a massive scam to Simon.
The identity of Simon's informant is revealed; Fitous, Bouli and Attias are making millions; the constant lies and absence of Annabelle's husband increase her frustration; Zagury gets in touch with the thieves for the first time.
The French authorities finally try to arrest Fitous, Bouli and Attias but make a clumsy mistake; Simon discovers a new plan of attack as he attempts to turn Fitous and Bouli against Attias.
The fraudsters spend their stolen fortune but soon realise they are out of their depth; Simon questions why Attias made peace with people who humiliated him; Bouli and Attias make plans to meet; Emilie breaks into her father's house.
Emilie's boyfriend claims they want to get married asks Simon for money; Attias spends his money frivolously; Simon finds something to link Fitous to an offshore carbon scheme.
Fitous goes on the run; Attias cannot support Julia during her pregnancy due to his coke habit and lifestyle; Simon witnesses the shady world of high-powered finance as he traces the money to Hong Kong.
Simon finally has enough evidence against Attias, but the arrest is delayed due to an unfortunate incident; Attias comes up with a plan to sell information on a deal.
