Cindy’s answer to “Is this what Ruth Ware does? Take plots from other authors and rewrite them with "twists"? How extr…” > Likes and Comments

I agree, as long as the author acknowledges what they're doing, it's ok. It's like including a citation. :) I was really looking forward to Turn of the Key when it was being published because it's always fun to see a good retelling of the Henry James.