As Grace goes about cheerfully offing anyone who gets in the way of the family's happiness, the movie takes a refreshingly pro-murder tone that would be more interesting if it were given any sort of bite. Instead, it's just sloppy plotting, as all of Grace's meddling makes only superficial changes that don't address any real issues, but somehow solves everyone's problems nonetheless.
The charm of this genre has worn thin after endless variations on the concept, and Keeping Mum is decidedly short on genuinely funny moments. Atkinson gets about half a scene to do his bumbling Mr. Bean shtick, and otherwise plays things disappointingly straight. After quaint small-town residents stripping, stealing a dead man's lottery winnings, growing marijuana and shoeing drag queens, committing murder is perhaps the next logical step; it might work as a parody of this genre if it weren't played just like another formulaic retread.