In the 1920s, long before he wrote The Little Prince, Antoine de Saint-Exupéry was an accomplished pilot. Along with Jean Mermoz and Henri Guillaumet, he was chosen to pioneer new mail routes across the globe, and no distance was too far and no mountain too high—each letter had to reach its destination. In this fictionalized retelling of three remarkable lives, the author of The Librarian of Auschwitz follows the three friends on their aerial adventures, while back on solid ground, they make their way in a world torn apart by wars and political factions.