Drowned in the Grand Canal (1)

1777: France and England are at war over the independence of the United States. Nicolas le Floch, missioned by Louis the 14th to spy on the Duke of Chartres, who has his sights on the admiralty, witnesses the latter's cowardice in combat. He reports the facts to the king who nominates his cousin General of the light cavalry instead ... Le Floch has just made a mortal enemy out of him.