Mont Blanc: summer of 1961. Three Italian climbers, led by charismatic Walter Bonatti, meet four French colleagues, led by Pierre Mazeaud, completely by chance at the Fourche campsite on the French-Italian border. They’ve decided to be the first to climb the Pillar of Frêney, a pillar of rock 750 metres high at the summit of the Mont Blanc. It’s an extremely difficulty climb. C...