The Shadow of the Earth.

Rich in environmental mood and ethnic color, this human drama chronicles the lives and rituals of a nomadic Berber tribe in the southern Tunisian desert, especially focusing on a son about to inherit the full mantle of leadership. When he sees that their sheep are threatened with a possibly devastating illness, the precarious nature of the group's existence is brought home to him and he leaves to gain a livelihood and knowledge in the city. Once he gets back, bringing money and presents, it first appears that the group will be assured of a better future because of his enterprising outreach. Yet military and governmental officials arrive on the scene to take a census and the young man is conscripted, against his will.