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.
Yes, 'Knives Out' is based on a true story. The movie draws inspiration from real - life events and situations to create its complex and engaging mystery plot.
As of now, I don't know the specific name of the novel on which 'Knives Out' is based. There could be various reasons for this, such as it being a relatively new or not - so - well - known novel that hasn't received as much mainstream attention in relation to the movie.