At just 21 years old, François-Henry has left his family and friends behind to join the prestigious French military academy of Saint-Cyr. In a few years from now, he will lead an army battalion. In the meantime, François-Henry must learn how to become a good officer, with both combat training and lessons in the classroom. Some 3,000 people take the Saint-Cyr entry exam each year, but only 180 of them manage to bag a place.