Mystère sur la dune à l'Île de Houat

Augustin and his cousins go to the Fort d'En-Tal in France. What a beautiful place for their vacation on the island of Houat. This new environment is the place of strange phenomena. Augustin, who wants to become an archaeologist like his grandfather Mathieu, does not give up. He leads his cousins on the trail of raiders who could destroy the remains of ancient battles. Will the Cultural Heritage Adventurers arrive in time?