Books which take a massive left turn leaving an unexpected plot? idk

A bit of an abstract ask but: I want a book which will confuse me midway through. Maybe establish a normal conflict and then halfway through go woops by the way this isnt a scifi it's a fantasy and wizards exist.
or total ganre change: whoops you thought the book was about fighting a bad guy in space? well let me introduce a Bplot where the ressurected ottoman emperor has a romance arc with palpatine