Assigned to a police station in an Occitan village after an operation that left half her face scarred, Parisian police captain Noémie Chastain sees her mandatory recuperation period take a very dark direction. Instead of simply reporting on police station activity and its possible closure, she suddenly finds herself involved in a twenty-three-year-old disappearance case. The first barrel containing the skeleton of a child is discovered on the surface of the artificial lake under which the submerged village lies... Despite the fact that her superiors consider her vulnerable, the captain resolutely takes on the case. However, this unusual investigation will bring back aspects of her own life...