A documentary on the Val d'Aosta Alpine Rescue Unit. But it is mainly a film about life and choices. We follow, for a year, three ordinary lives, ready each day for something extraordinary, three guardian angels that fly on board a helicopter, simply to offer assistance. Over the noise of the emergency, the film narrates a radical choice, that of Silvia, an emergency intensive care anaesthetist, involving in every instance the thread of life, of waiting, of solitude.