Lidia Achour returns to Peranne following the disappearance of her former partner, Jean Benefro. In addition to Jean's disappearance, a series of gruesome murders pushes Lidia to investigate relentlessly, at the risk of awakening a painful past that everyone thought buried.

Two young thugs create a small company called "The Cleaners" in order to deceive and rob the rich homeowners using an elaborated scam. After a series of bad luck, they are in the hurry to make their biggest con yet. But their target - a single woman in a luxurious villa - isn't who they think she is.

Marianne Vauban is an outspoken investigating judge with surprising methods and disarming sincerity. Accompanied by Captain Pastor and her clerk Yves, Marianne must draw on all her experience, sagacity, and empathy to investigate complex cases in astonishing worlds. But one case is particularly close to her heart: the murder of a prostitute ten years ago. She promised the victim's son that she would get to the bottom of this murder.

Léo, a retired policeman, seems concerned about the disappearance of a child in the neighborhood. Is he the boy's father or his captor?