American Horror Story season 13 details are coming into focus from the boss himself. Although recent set photos from filming in New York City led many fans to believe the season would revisit Coven, Murphy said that’s only part of the story. “Everybody thinks it’s a Coven season and it’s not. Ryan Murphy tells us 'American Horror Story: 13' is "not a Coven story" ― it's so much more. Ariana Grande was originally set to make her American Horror Story debut in season 13 but exited due to scheduling conflicts with her Eternal Sunshine tour.