Filmed chronicle by mountain filmmaker Mario Fantin, of the 1964-1965 expedition of the Italian mountaineer Guido Monzino to the summits of Hoggar in the Algerian Sahara with the ascents of Garet el Djenoun, Tizouyag Nord, Saouinan and Iharen. The mountain ranges of the Hoggar desert turn out to be more complex and interesting than most mountaineers suspected at the time.