Alice and Nadia are two French women who have little in common except maternal love: they are faced with the challenge of saving their sons from drugs, prison, and death.

Police cadet Fred Leprince is found dead inside the police academy. His sister Émilie, also a cadet there, doesn't believe the suicide theory.

Fed up with her cheating husband, Louise, 45, takes off for a weekend in Corsica. But after a wild night of unbridled passion with a man who winds up dead, Louise is unwittingly mistaken for his secret, longtime girlfriend by his Corsican fearsome but loving mother.

Nowadays, in Paris, a student who occasionally prostitutes, a freshman drug dealer, a trader who makes a ton of money... Money, pleasure and ambition are the cement of their relationship. In today’s world, they love and hurt each other.

In the Summer of 2024, Paris is hosting the World Triathlon Championships on the Seine for the first time. Sophia, a brilliant scientist, learns from Mika, a young environmental activist, that a large shark is swimming deep in the river. To avoid a bloodbath at the heart of the city, they have no choice but to join forces with Adil, the Seine river police commander.