In Assassin's Creed Unity, which Paris landmark is the setting of Arno's first major investigation?

In Assassin's Creed Unity, Notre-Dame Cathedral is the setting of Arno's first major investigation.

Arno Dorian becomes involved with the Assassin Brotherhood during the French Revolution. One early investigation takes him to Notre-Dame, where he follows evidence connected to the murder of Monsieur de la Serre and the wider Templar conspiracy.

The cathedral is one of Unity's signature landmarks and can be explored externally and internally. The Louvre and Versailles also appear in the game, but they host different missions and historical contexts. Notre-Dame's detailed recreation was created before the real cathedral suffered its 2019 fire.