I’m looking for a certain type of twist…

The name for this trope is “Tomato Surprise.”

Basically, it’s a twist where something is revealed in the narrative that was always obvious to the characters — but is a revelation to the readers. Such as: none of this story actually takes place on planet earth, or the protagonist isn’t human but is actually a monster, an alien, or something “other” than they present as on first glance.

I realize this is a very specific ask, but I would love to know if anyone has read a book or short story that does this!

by Swordbender