Algeria, 1960. A section of French paratroopers is sent to look for a plane that has disappeared in the Algerian desert. The wrecked plane is rapidly located, but there are no survivors, just a briefcase stamped "Classified - Top Secret". Attacked by enemy soldiers, the troop finds refuge in a strange abandoned citadel. Despite the warnings of the building's custodian, the soldiers awaken the Dijnns, the evil spirits of the desert.