In Sur le Fil, Benjamin Védrines embarks on an unprecedented traverse of the Alps, linking the Grandes Jorasses, the Matterhorn and the Eiger via their iconic historic ridgelines, without interruption. Covering 320 kilometres and 14,000 metres of elevation gain, he achieves an extraordinary mountaineering feat, among the most ambitious ever undertaken in the massif.

But beyond the achievement, the film tells another story: that of a man driven above all by the fluidity of movement, the beauty of great alpine routes, and the simple joy of spending several days immersed in the mountains.