Accra has fallen, the Holy Grail is lost deep in the sea. At the same time the grand master Templar is slaughtered and the plot is starting a by letting Landry not knowing what to do... .
On the Pope's orders, Landry and Tancrede travel to invesigate the Holy Grail's whereabouts. Meanwhile, the plotting behind the royal wedding becomes deadly.
Landry is kidnapped and tortured by a mysterious group. A Knight is expelled from the Templars. De Nogaret builds an army. Princess Isabella discovers who betrayed her.
During the search for the grail, Landry and Gawain meet a mysterious woman claiming knowledge of its location. Joan discovers there was an attack on Navarre. De Nogaret plots to return to the King's good graces.