Au cours d'un prestigieux tournoi d'échecs, l'un des joueurs favoris s'effondre en plein match, foudroyé par un poison. Astrid et Raphaëlle prennent alors conscience qu'elles se trouvent au coeur d'une sanglante partie d'échecs grandeur nature.
Durante un prestigioso torneo de ajedrez, uno de los jugadores favoritos se desploma en medio de una partida, fulminado por un veneno. Astrid y Raphaëlle se dan cuenta de que están en el centro de una sangrienta partida de ajedrez a escala real.
Thirty-two of the best international players participate in the Pretenders Tournament at the Hôtel des Ambassades. At the start of his match Mikael Koroleva, one of the favorite players, suddenly had a nosebleed and collapses, struck down by poison. On site, Astrid and Raphaël try to find the culprit among the players. They soon discover that Shun Naito is cheating against his new opponent via his watch connected to artificial intelligence. Shortly after, Naito was found dead below the hotel: he had been beaten and thrown out of the window.
Astrid e Raphaelle indagano sulla morte di un partecipante di un torneo di scacchi.
