"Knives Out" is a perfectly entertaining, perfectly agreeable little film, a star-studded old-style murder-mystery that's good fun while it lasts. The actors involved all seem to be having fun and the plot keeps you engaged, even right up to the reveal when you will, as can often happen with these things, find yourself saying, "Oh, so that's...hang on, that doesn't make any sense". For indeed, plot and motivation holes abound and ultimately you're left with a decent film (although some might find the lie/reflux plot point a trifle irritating). It's fun enough, the kind of film best watched after Christmas lunch with the family, but it's not a game-changer in any way.