This book definitely

If you could change the ending of any book, which one would it be?

Flowers for Algernon is a book by Daniel Keyes. I read the book a long time ago. It follows a man with a low IQ named Charlie. He has an experiential surgery and becomes a genius. He watches a mouse named Algernon, who underwent the same surgery as he did. He watches the mouse’s intelligence regress, which eventually his intelligence regresses also. I would make it so he is always a genius. Thank you for reading. Have a great night.