Baron Ferdinando Cefalu is very much in love with his cousin, Angela, and wishes to marry her. The only problem? He's already married. Since divorce is outlawed the Baron decides to get rid of his wife with a lesser crime: murder. "Divorce, Italian Style" is a pitch black satire of a chauvinist society and Italy's hypocritical judicial system.
Marcello Mastroianni, best known for his starring role in 8 1/2, is delightfully woeful and sarcastic as Baron Cefalu. His expressions and his nervous tics provide several good chuckles. Daniela Rocca is perfectly annoying as Baroness Cefalu, making it quite easy to take delight in her husband's murderous fantasies. Stefania Sandrelli is quite good as Angela. Her scenes with Mastroianni are especially passionate and, since this was one of Sandrelli's earliest films, they show a real talent in the making.
While I did laugh at "Divorce, Italian Style" (as well as that amazing Criterion cover art), don't expect a straight up comedy. It does make a serious point about the failings of Italy's judicial system. I will also admit that watching Baroness Cefalu drown in quicksand was an unpleasant sight, and not funny at all. Watching her get blasted into space = side-splitting laughter. Watching her drown in quicksand = uncomfortable.
However, don't be detered from this film. If you've never seen any of Mastroianni's films this is the one to start with.