I figured out the plot of AHS: Hotel.
It is called “AHS: Hotel.”
The clue in season 4 was the top hat that appeared on many cups and menus.
Ryan Murphy says it would be like nothing they’ve ever done.
I strongly believe it will be about America’s first serial killer HH Holmes. He lived in 1893, and opened a hotel during the Chicago World’s Fair. However, it wasn’t really a hotel. It was really a murder maze of sorts, where he would lead people (mainly young women) in by saying it was a hotel, but he then would torture them. It was almost literally a maze, with locked doors, false stairways, etc. He would then lock them in their rooms and fill it with gas where they asphyxiated. After, he would throw them down a chute Sweeney Todd style, and dissected them, strip them of flesh, and craft skeletons in the basement. Also, his mark was that he always wore a top hat.