How to Solve the Ghost at The Saint-Denis Cemetery Mystery in Red Dead Redemption 2?
You can encounter the ghost of Saint Denis during the Angeld Bronte, A man of honor mission. During the mission, you have to go to the cemetery with John.
You will spot the ghost at the very entrance, she immediately runs away and disappears, Bullets have no effect on her, she appears numerous times in various places.
So there's a huge chance you'll see her at least once. The Saint Denis ghost is based on Sylvia Ganush, she's a character from drag me to hell (2009).
As you can see, they both have the same eyes.
And very similar clothes.
There are two encounters you can find here during the mission.
The Dog which leads you to the grave robbers, and the Drunk who came to mourn his dead friend.
Originally the ghost woman was supposed to be the third encounter you could find during the mission, Deleted audio in the game files proves that. You can approach her while she was crying.
Pray it's a graveyard it's what people do here! Pray, John was even supposed to make a comment on her looks, the woman went from sobbing to a crazy laughter.
Sylivia Ganush had similar mood shifts in the film, Eventually rockstar changed the ghost easter egg, Sylvia was a ghost for the most part of the film as well.