After three weeks' training, young aspiring CRS officers are deployed in the field. Most of them have never set foot in a demonstration before. Each arrives with certainties, but also with questions. They train, apprehend and fantasize about their opponents.

Juliette is attending the baptism of Lucas, the son of her best friend Claire. But the young mother, weakened by her childbirth, shows disturbing signs of depression.

Alex, a young, somewhat lost, daydreaming graphic designer, falls for his new neighbor Lili, a beautiful Asian girl. Too shy to approach her, Alex secretly observes her and quickly discovers her secret: Lili does not come from China, but from far far away.

Deep in the heart of the Moselle, in the Uckange furnace Park, is a crime scene as spectacular as it is baffling. The victim is the former Director of the site. When the relentless but sensitive Clément Leroy, captain of the criminal section of the Metz gendarmerie, sets out to investigate, he reconnects with his childhood love, Laure Thouvenin, the victim's daughter and a specialist in industrial history. As this free and unconventional woman becomes increasingly involved in the case, she and Leroy unravel the shocking story of their respective families running over three generations.