In a castle, during the rehearsal of a sword fight for a medieval show, one of the contenders, a knight in an armour, collapses. When they take off the helmet, it is not Philippe Reyes, the stuntman, as expected, but Noémie de Laurentis, one of the owners of the castle. Preliminary examination indicates that she was poisoned. Paul and Léa with the team must find out why she was wearing the armour. Lieutenant Inès Zaïdi returns from the Guayana to join the brigade.
—mgallegog