It is 1930, Antoine de Saint-Exupéry, a dozen or so years before the publication of his most famous book "The Little Prince", works as a pilot for the air mail company Aéropostale in Argentina. One day, his friend Henri Guillaumet does not return from one of his journeys. Despite the expected dangers, Antoine decides to set off in search of the missing pilot. This seemingly impossible task will force him to cross the high mountain range of the Andes and his own weaknesses. During this expedition, the pilot will experience many impressions, which he will later use to create his extraordinary book.