Elsa and Laurent, happy parents of Lucie, have lived a perfect love affair for twenty years. Until one morning, Elsa disappears without trace. Laurent's world collapses when the police inform him that Elsa was in fact a very different person from the one she pretended to be.
Patrick is a tenacious lawyer specializing in environmental law. France is a schoolteacher who becomes an activist after her husband develops cancer from exposure to a pesticide. Mathias is an ambitious lobbyist working for an international chemical corporation. The paths of these characters collide as the lives of thousands are affected by a tragic act that sparks a powerful movement while the corporation fights to prevent the truth from being revealed.