A chase begins between Ben and Flo and the duo of Albanian gangsters. The Oyster Festival is in full swing in the city center, an opportunity for the two geeks to escape Alkan and Veran by blending into the crowd. Elise follows up on her investigation but has difficulty being taken seriously by her superiors.

The two geeks now have no choice, they must go explore the Ile-de-France jungle, left to their own devices. Their first mission is to find a weapon. No room for error, because Alkan and Veran closely monitor Ben's parents. But the Albanians had not anticipated Elise's arrival for dinner...

Ben and Flo return from Paris alive, but invested with a very dark mission. Alkan rejoices at Mehmet's supposed death and arranges for them to meet in a place away from prying eyes, with him also having a dark idea in his head. Elise is closer than ever to discovering the pot-aux-roses, the noose is tightening.