Wikipedia sums up the plot as follows:
Easy Virtue is a social comedy in which a glamorous American widow, Larita, impetuously marries a young Englishman, John Whittaker, in the South of France. When they return to England to meet his parents, his mother takes a strong dislike to their new daughter-in-law, while his father, Jim, finds a kindred spirit. Family tensions escalate.
This movie is non-stop fun and intrigue from the start. Filming a box office blockbuster with special effects might sound hard but making a parlor conversation interesting is much more difficult. If you've ever tried to make your own film you know that finding a way to make a simple conversation engaging for the audience is a real challenge. This film is mostly dialog but it never gets boring; also the lively jazz music and interesting camera work keeps you involved without being a distraction.
Many interesting talking points are brought up. For example, a married couple is caught having sex in a barn by the groom's mother and a group of men who looking to purchase the land. Some of the characters in the film think this is a terribly scandalous moment while others think it is simply funny. (Impressively, the director captures this scene tastefully - a talking point in itself.)
The ending is unorthodox and will cause a lot of discussion - but it works. The entire film impressed me and never provided a dull moment. I can't recommend it enough.