In Assassin's Creed Unity, Arno Dorian investigates a conspiracy in Paris during the French Revolution.
Arno is raised in the household of François de la Serre, the Grand Master of the French Templars. After François is murdered, Arno joins the Assassin Brotherhood and investigates the political and personal forces connected to the killing.
The game is set in Paris beginning in 1789, the year the French Revolution erupted. Its story includes recognizable figures such as Maximilien Robespierre, Napoleon Bonaparte, and King Louis XVI, although the main plot is fictional.
Élise de la Serre is an important Templar character and Arno's former companion, but she is not the playable Assassin. Jacob Frye belongs to Assassin's Creed Syndicate, which is set in Victorian London.