‘Knives Out’ is razor-sharp

Placing its own slightly unorthodox twist on the Agatha Christie whodunit -- complete with an all-star cast, seemingly having a grand time doing it -- "Knives Out" is a whole lot of fun, intended to keep the audience off-balance right up until the finish. It's a razor-sharp throwback from writer-director Rian Johnson, which almost feels like a palate cleanser after directing the last "Star Wars" movie.