A crew of highliners rig nylon webbing across gaps hundreds of meters above the ground, then walk it, with Mont Blanc's glaciers and rock faces as the backdrop. The film follows the sport as an extension of slacklining pushed to extremes: longer spans, greater exposure, and the mental discipline needed to stay calm on a line swaying above open air. Footage captures riggers anchoring webbing between peaks, walkers falling into their leashes and climbing back on, and the wind and altitude that make each crossing different from the last. The Mont Blanc massif gives the project its centerpiece line, shot from angles that show both the walker's perspective and the scale of the drop beneath them. Rather than explaining the sport in voiceover, the film lets the highliners' preparation, focus, and occasional fear speak for the appeal of balancing where a slip has real consequences. It plays as a short, focused portrait of a niche extreme sport and the people obsessed with it.