France, 17th century, during the reign of Louis XIII. When a dear friend, the Duke of Nevers, is treacherously assassinated by a powerful relative, a skilled swordsman, the noble Henri de Lagardère, seeks his rightful vengeance as he tries to protect the innocent life of the duke's last heir.
To his family, François Voisin is nothing more than a humdrum civil servant. In truth, for the past twenty years he has been working as a secret agent. All goes well until circumstances put his secret in danger.
A disillusioned police detective, used as a scapegoat by his corrupted superior, fights back by becoming a competent criminal.
