France under Louis XIII. 1615. The Duke of Angoulême is at the head of a group of gentlemen who are conspiring to drive the Florentines out of court, of whom Concini is the all-powerful leader. A cadet from Gascony, Adhémar de Capestang, who was later to become the Capitan, left his native province to come and try his luck in Paris. Along the way, he saves a young girl, Gisèle d'Angoulême, from a masked individual who wanted to kidnap her.