1976. When her marriage falls apart, Agnes Le Roux moves back to the South of France from Africa to live with her mother, Renee, owner of the Palais de La Mediterranee casino in Nice. There, Agnes falls in love with Maurice Agnelet, a lawyer and Renee's business advisor, who is ten years her senior. Maurice continues to have relationships with other women. Agnes is madly in love with him. As a shareholder in the Palais de la Mediterannee casino, Agnes decides to sell what should have been her inheritance to go it alone. A fixed card game threatens the casino's financial stability. Someone is trying to intimidate her mother. Behind the scenes hangs the shadow of the mafia and Fratoni, the owner of a rival casino, who wants to take over the Palais de la Mediterannee. Agnelet, who has fallen from grace with Renee, introduces Agnes to Fratoni. Fratoni offers her 3 million francs to vote against her mother in the shareholder's meeting. Agnes accepts the offer. Renee loses control of the casino. Agnes finds it hard to cope with her betrayal. Maurice also distances himself from her. In November 1977, after a failed suicide attempt, Agnes disappears. Her body is never found. Thirty years on, Maurice Agnelet remains the prime suspect in a murder case with no body and no proof of his guilt. Convinced of his involvement, Renee is prepared to fight to the bitter end to see him put behind bars.