Knives Out is not a novel. It's a popular movie that has gained a lot of attention for its intriguing plot and excellent cast. The story is presented on the big screen rather than in a book form.
There are fanfictions that change the plot slightly. Maybe in one, the real killer is someone completely unexpected, not following the original movie's mystery setup. It could add new twists like a secret alliance between two characters that was not in the original. Some fanfictions also explore romantic relationships between characters that were only hinted at in the movie.
Yes, 'Knives Out' was inspired by real - life mystery stories and the classic whodunit genre. The filmmakers took elements from various mystery tales and created their own unique story within that framework.
One of the top stories could be about the complex family dynamics in the movie. The Thrombey family has a lot of secrets and rivalries that are gradually uncovered, which makes for a very interesting plot.