Writer Sylvain Tesson accompanies the French High Moutain Military Group in their Patagonia expedition. United by the same love of moutaineering, they want to pay tribute to the Aรฉropostaleโs heroes โ Mermoz, Saint-Exupรฉry and Guillaumet โ climbing the Fitz Roy rangeโs and jumping from one of its summits.