Desc: Sur le fil des 4000: Directed by Gilles Chappaz, Raphaël Lassablière. With Patrick Berhault, Philippe Magnin. On March 1, 2004, Patrick Bérhault and Philippe Magnin set out to climb one after other, all 82 summits above 4000 metres in the Alps. Both climbers are well-known for their solid experience and purist approach to climbing, so the emphasis for this large-scale project is on making the most of the pleasures of mountaineering. They brave changing weather and strong emotions as they proceed on their long journey into the unknown. On April 28, after almost two months of climbing, they are making their way along Nadelgrat, an interminable ridge between Täschhorn and Dom leading up to their 67th summit, when without warning, a rocky foothold falls away and Berhault falls and dies.