The mountains are a barometer of the state of the world because global warming is three times more visible there than elsewhere. After a year marked by the confinements of March and November and the closure of ski resorts, the high peaks have regained their appearance of the first days. It is in this fragile setting of beauty that a young committed rope party sets out to cross the heart of the Alps on ski touring, to decipher for themselves the visible and invisible signs that threaten them, and to question a situation that goes beyond mountaineering