The lives of upstairs guests and downstairs servants at a party in 1932 in a country house in England as they investigate a murder involving one of them.
 
I'll make this simple.  If you're a fan of Downton Abbey, then watch this one.  Otherwise, you might have trouble sitting through this film.
 
FUN FACT:  In the DVD commentary, producer and director Robert Altman stated he included the "f" word several times on purpose to get an R-rating because he didn't want kids to see this movie. He thought kids wouldn't like the movie, so he wanted to keep them out (especially fourteen-year-old boys).