Tell me a book with an absolutely spectacular plot twist

Horror / thriller / mystery anything works, no generic and basic kind, I want a life changing plot twist, a 100/10 kind of book

I've read and then there were none by Agatha Christie, have a few books in my cart like: the silent patient, the girl in the glass case, the woman in the window, murder on gokumon island, the murder of roger ackroyd (heard about these on ig or here itself)

No spoilers please, not even little ones!