A family of four children who grew up together. Among them, twins: Manon, a discreet schoolteacher who lives in the shadow of her native village in the Vosges, and Alexandra, an actress who lives in the light in Paris. The night before their 40th birthday, which they are to celebrate with their family, Manon disappears. Kidnapping? Assassination? Accident ? Voluntary disappearance? The police investigation is coupled with an intimate investigation. While searching at Manon's house, Alexandra discovers that her sister had stolen clothes and jewelry from her and was disguising herself in her. Excessive admiration? Duplication of personality? Perverse game? Behind the veil where everyone hides, do we really know those we love?